* Fixes some toolbox/toolbar styles and variables

* [squash] Fixes variable name to fit better its purpose

* [squash] Fixes secondary toolbar variable name

* feat(local-video): convert to react

- Create a VideoTrack component for displaying a video element.
  This mirrors native also having a VideoTrack component.
- The VideoTrack component does not let React update it to prevent
  the video element from re-rendering, which could cause flickers
  and would not work with temasys's overriding of the video element.
- VideoTrack extends AbstractVideoTrack to mirror native
  implementation and to get the dispatch of the onplaying event.
- Remove the onclick handler on the video element. Honestly, I
  didn't get it to work, and did not try, but it is also unnecessary
  because another handler already exists on the video wrapper.

* ref(device-selection): VideoInputPreview uses VideoTrack to show video

* squash into conversion: change css selectors

* squash into conversion: mix in abstract props

* squash into conversion: change shouldComponentUpdate check

* squash: update comment about why triggerOnPlayingUpdate is used

* Fix(AddPeopleDialog): Fixes error state and close dialog

* (to-squash) Addresses comments

* feat(indicators): move the "top toolbar" indicators to react

* wrap baseindicator

* fix(filmstrip-only): vertically align center the toolbar

Use top 50% to position the toolbar's top at the vertical center
of the iframe. Then use transform 50% to move the toolbar itself
up 50% so its middle matches the middle of the iframe.

* squash: toolbox should center with filmstrip

Popover works by first creating a DOM element with display none
then having jquery calculate its width and new position and
then setting display to table. This does not work with p2p
connection stats, which are much wider than the default width
of the popover. What will happen is when display table is set,
the width will increase greatly so the positioning will be off.
The workaround here is to set display table as the default
display but toggle visibility instead.

Icons on the thumbnails can flicker when scrolling through videos.
To give rendering a bit more power, and thereby help with rendering
icons without flickering, force hardware acceleration.

Move display of audio muted, video muted, and moderator icons,
which make up the elements of the small video toolbar, into React
Components.

- Create a new ConnectionIndicator component for displaying an
  icon for connection quality and for triggering a popover. The
  popover handling has been left in ConnectionIndicator for now,
  which follows the existing implementation.
- Remove the unused method "connectionIndicatorShowMore"
- Change the implementation of existing methods that update the
  connection indicator to call the same method which will rerender
  the indicator completely.

With popover usage now only passing in React Components, the
logic of removing the popover and recreating its html with
every update is not necessary. Instead allow React to update
the popover contents.

Because of this change, mouse event handlers are not recreated
on each update, so it is possible for mouseleave to fire after
the size of the popover shrinks when collapsing to hide more stats,
forcing the mouse out of the popover. To prevent this, padding has
been added to the top of the popover so on resize the mouse will
still be over the popover. The padding has the added bonus of
fixing an issue where the popover would not close until mouseenter
was triggered after size collapse, but it adds the drawback of
requiring more upward mouse travel to close the popover.

- For horizontal mode, remove extra spacing created by borders
  around local video and remote videos.
- For vertical mode, ensure remote videos grow only to fill the
  parent height.

Currently, the JitsiPopover z-index will cause it to display below
any toast notifications so this changes modifies the z-index
values so JitsiPopover is higher than the notification toasts.

Add ninja icon which wil be displayed when user's connection status is
inactive.

Apply grey filter only for interrupted state.

Do not use isLastN directly, but check ParticipantConnectionStatus.

* fix(vertical-filmstrip): different label animations for filmstrip states

Instead of one timing for sliding the video status label left and right,
have different timings depending on the filmstrip state. To facilitate
triggering the different animations, add more classes to the labels
that need to move that specify the filmstrip state.

- Faster transition if focusing on self-view with videos present so
  the label does not overlap videos transitioning from 0 opacity.
- Transition delay when de-focusing on self-view with videos present
  so videos have time to go away before the label moves over them.
- Maintain no movement if there are no videos, regardless of
  filmstrip toggle state.
- Different delays for when the filmstrip is being toggled visible
  and hidden if there are remote videos visible.

* SQUASH: remove remote videos count

* SQUASH: add docs to scss

- Change z-index so any tooltips that display over the label,
  particularly in vertical filmstrip mode, actually hide the label.
- Change the cursor to be a pointer so the label looks clickable.
- Remove unused audio-only-label styling.

The video status labels, which include recording and hd status,
have been moved back to the top left while in vertical filmstrip
mode. The following had to be done:
- Remove styling to move the labels to the bottom left
- For VideoStatusLabel, move filmstrip remote video count, toggle
  state, and 1:1 state into redux.
- Use middleware to emit out to the Recording label when the
  filmstrip changes.
- Create an empty Filmstrip file for web and identify the existing
  Filmstrip component as native.

- Expose an api on Filmstrip to hide the remote videos container, which does so
  by adding a class
- Modify listeners for user join, leave, share video to call the api
- Hide the container when there is 1 or fewer remote participants
- Always show the container if self view is in focus
- Show the container if the number of remote thumbnails does not match the count
  of remote participants, such as the case of sharing a video

- Add a class to the body when in vertical filmstrip mode
- Override styles as necessary to support the mode
- Add an option to make tooltips display from the left
- Move the HD Label to the bottom left
- Move the remote video menu to the bottom left, move the mute
  icons to the bottom right
- Scale the local video's height and width to fit the filmstrip

The 1:1 call UI and vertical filmstrip act on remote videos
while leaving local video alone. To facilitate acting only on
remote videos, place remote videos into their own container element.

Audio only mode will be toggleable only from the VideoStatusLabel,
so remove AudioOnlyButton from the toolbar and delete the component
itself. As a result of the button being removed, a truthy check in
VideoStatusLabel was also removed to ensure it will display as it
is now the only way to toggle audio only mode. Also set the cursor
on VideoStatusLabel to always be default, so it can never show the
text cursor.

Add a menu that displays when hovering over VideoStatusLabel. The menu's
display is controlled by CSS. As the existing AudioOnlyLabel no longer needs
needs its own tooltip, it has been removed and label display logic has been
moved into VideoStatusLabel.

DialInNumbersForm has been modified to display a conference id to be used for
dialing into the conference. The changes include:
- Requesting the conference id and adding the conference id to the redux store
- Displaying the conference id in DialInNumbersForm
- Modifying the copy behavior to support copying the new message to clipboard
- DialInNumbersForm does not display until all ajax requests have completed
  successfully. This eliminates the need for the REQUESTING state.

Device selection has live previews that reuse the current local
audio and video tracks for the sake of internet explorer. This
means when the local video was muted, device selection would
show a muted message. It is preferred to show a live preview
even when muted.

The changes include:
- Passing device ids into DeviceSelectionDialog, not tracks.
- Setting default selected devices to use for live previews.
- Removing all checks in DeviceSelectionDialog involving local tracks.
- Catching and displaying errors when creating a live video preview.

Move the HD label into the newly renamed VideoStatusLabel
component. That way it cannot be possible for the audio only
label and the HD label to display simultaneously.

Audio only mode can be used to save bandwidth. In this mode local video is muted
and last N is set to 0, thus disabling all remote video.

When this mode is enabled avatars are shown.

In the filmstrip inlay, the avatar container holds the avatar
image. The image is set to 100% height, so it displays entirely
in the container. However, this does not adjust the horizontal
space created by the image in firefox, leaving whitespace to the
right of the avatar. The fix is to set the container height to
100% so that all its content will fit inside, automatically
adjusting the space created by the image width.

Create a new React Component for displaying a list of dial-in
numbers. The Component will fetch the numbers from a new
numberRetreviewUrl key/value set in config. If not present in
config, the Component will not be displayed.

AtlasKit DropdownMenu cannot be disabled, unlike Single Select.
The result is the isDisabled prop was not being honored. The
workaround is returning only the trigger element for the dropdown
and styling it to look like the dropdown is disabled. The text
for disabled device selection was changed along the way to fit
into the trigger.

Safari will prevent proper input behavior when user-select none
is applied. It prevents such actions as putting in a room lock
password or setting a room lock password. Other browsers allow
selecting on inputs while user-select is none.

AtlasKit Dropdown was recently updated to support fitting the
width of its container. However, AtlasKit Button, the trigger
element currently used for the dropdowns, does not fit the width
of AtlasKit Dropdown and stll has text overflowing out of its
button when there is an iconBefore prop passed in. Instead of
using AtlasKit Button, use a div and mimic the button look. This
allows the "button" to fit the container width and can display
ellipsized text within itself.

@virtuacoplenny, the changes of this commit are not necessarily in
source code that you introduced in
https://github.com/jitsi/jitsi-meet/pull/1499 but I saw violations in
files modified in the PR which I had to read in order to understand the
PR.