Will try to use screensharing instead of camera video from
the beginning.

* 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

config.disableDesktopSharing - when set to false will disable desktop
sharing

interfaceConfig.DESKTOP_SHARING_BUTTON_DISABLED_TOOLTIP - when value is
assigned, will not hide the desktop sharing button completely, but show
as disabled with this value used as the tooltip text.

Remove duplication and direct access to kind of private 'state' field by
introducing 'getCurrentContainer' method.

Dynamically enables/disables the toolbar video button. Prior to that
commit if we would start with no video there would be no way to enable
it later on.

The container needs to store user's ID in order for the 'isOnLargeVideo'
logic to work correctly when user has no stream (previously it was
obtained from stream which can be null/undefined).

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

* wrap baseindicator

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.

Reported by Manav.

#1730

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

* feat(avatar): SmallVideo uses the existing Avatar component.

* feat(display-name): convert to React

- Create a new React Component for displaying and updating display
  names on small videos
- The updating of the Component is defined in the parent class
  SmallVideo, which children will get access to through prototype
  copying
- Create a new actionType and middleware so name changes that occur
  in DisplayName can be propogated to outside redux
- Update the local video's DisplayName when a conference is joined
  or else the component may keep an undefined user id

* squash: query for the container, not the el owned by react

Get rid of global APP.conference.screenSharingPromise.

- 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.

Move all logic related to displaying a table of connection stats to a React
Component. The actual parsing logic was modified as little as possible as the
focus is moving display to React.

Vertical filmstrip has a scrollbar to scroll through all remote
video thumbnails instead of scaling width and height to force all
thumbnails to display on screen. The scaling is not necessary in
vertical filmstrip mode and instead causes some UI spacing issues
with the video status label.

Also addressed a typo in "removeVideoWidth" near the area of the
changed logic.

- Create new React Components for RemoteVideoMenu and its
  buttons
- Remove existing menu creation from RemoteVideo
- Refactor RemoteVideo so all function binding happens once in
  the constructor, removing the need to rebind when updating
  the RemoteVideoMenu
- Allow popover to append and remove React Components from itself
- Refactor popover so post-popover creation calls are broken out and
  popover removal behavior is all done in one function.

In RemoteVideo, creation of the RemoteVideoMenu (popover) is
skipped if in filmstrip only mode. However, updateRemoteVideoMenu
is called by other components, and that tries to access popover
and will error.

Add a defensive check for now as filmstrip is being rewritten
for react.

When using onplay in firefox, the event fires before data is flowing,
which can cause videoHeight and videoWidth to be 0 during resizing.
By using onplaying, there is some assurance data is being received,
so videoHeight and videoWidth should be set.

Removes ' character which should not be there.

'_isConnectionActive' is not used anymore

The default for 'show' argument of 'showRemoteConnectionMessage' is
undefined (unspecified).

Simplify 'updateParticipantConnStatusIndication' by getting rid of
'showMessage' argument.

Also moves the logic about participant connection status from SmallVideo
to RemoteVideo, because it doesn't make sense for local videos.