fix(AudioOnly+web): crash when untoggle audio only

Because on web video track is stored both in redux and in 'localVideo'
field, video is attempted to be unmuted twice when turning off the audio
only mode. This will crash the app with 'unmute operation is already in
progress'. This commit will prevent from taking action from the web
world if the video track already exists and will make the redux side
rollback unmuted status in case unmute fails.

In another installment of "how on earth?!", using a 1px border instead of a
0.2px border fixes view clipping on a device where it didn't work before
(Moto X Play).

Observations:

- When nothing was rendered, rotating the device made the buttons show up, this
  makes me think the Surface is not properly composited with the toolbar view
  for some reason. Why this happens in some devices and not in others remains a
  mistery.

Other approaches attempted:

- Setting View.collapsed to false so it will remain in the view hierarchy. It
  made no effect.

- Setting View.needsOffscreenAlphaCompositing to true. It made no effect.

Just like before, I came up with this workaround by accident, but couldn't find
another way, so here we go again.

This essentially reverts
023359b9d2

In the filmstrip we keep a container full of thumbnail views. Destroying these
every time we want we want to hide it is costly, as new renderers have to be
recreated, and they lack context, so there is an increased chance for "black
thumbnails".

Start in audio only

When video is unmuted when toggling off the audio only mode it
dispatches video muted status, but does not roll it back in case it
fails. That was causing toolbar button on Web to display incorrect
video muted status.

* Fixes some toolbox/toolbar styles and variables

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

* [squash] Fixes secondary toolbar variable name

With the upgarde of @atlaskit/icon to 7.0.0, the size prop
essentially became required to maintain its appearance in the
jitsi app, otherwise it'll unexpectedly try to take up the
available space and cause minor display issues.

If muteVideo is called, before local tracks have been initialized it
will be synced up once the tracks are created (or not).

Will unmute local video (and ask for permissions if needed) in case user
started in audio only mode and is turing it off.

Will make the UI display audio/video muted icon for remote participants
with no audio/video track.

When the 'startAudioOnly' config option is set to true the conference
will start in the audio only mode.

The speakerStatus field already exists as part of the objects
in the participant reducer. When the library updates the
connection status of a user, plumb that update through to redux.

ref(stats): process stats through one pub/sub

Module poltergeist update

fixes handling of keyserver ASAP validation of tokens
wraps room and room-size APIs

set up async context for all poltergeist calls
utils lib now has async wrapper for event handlers

config: document enableFirefoxSimulcast

fix(connection-indicator): rename calls to hiding the indicator

Instead of passing stats through UI then VideoLayout then the
SmallVideo, pass stats directly to what uses it--ConnectionIndicator.
This also bypasses adding the stats to the store, as they do not
seem to be something that needs to be shared or stored app-wide
just yet.

navigator.product is read-only, so we don't run into the risk of it being
changed.

This was already an implicit requirement, as it's the only version implemented
in libwebrtc.

The reason to add this is to (defensively) try to filter old devices which may
not implement it.

WebRTC's own Android demo app defines this.

The end goal of this patch was to avoid opening the camera when there is no
welcome page.

In order to achieve this, the logic for creating the local tracks was
refactored:

Before this patch local tracks were created when lib-jitsi-meet was initialized,
and destroyed when it was deinitialized. As a side note, this meant that when a
conference in a non-default domain was joined, local tracks were destroyed and
recreated in quick succession.

Now, local trans are created and destroyed based on what the next route will be,
and this happens when the target room has been decided. This allows us to create
local tracks the moment we need to render any route, and destroy them when there
is no route to be rendered. As an interesting byproduct, this refactor also
avoids the destruction + recreation of local tracks when a conference in a
non-default domain was left.

If we do not reuse previous presences we lose avatar and name and people joining after the poltergeist creation will not be updated with those values.

Add config.startScreenSharing

The full-screen module uses the HIDE_DIALOG action to re-engage the full-screen
mode.

Adds http method to remove poltergeists. Adds configurable timeout after which poltergeists automatically are removed from the room.