The welcomePageEnabled and pictureInPictureEnabled props on mobile have been
converted to feature flags.

If audio-only was engaged, use the video (un)mute button to disengage it. This
should simplify the flow for getting back to video.

* fix(recording): do not prompt hidden participants for name

* squash: update package.json

Re-structure the custom routing to split between
platforms instead of between intended route features.
This made it easier for me to understand where to
do the checks for unsupported browser after deep-linking
had been checked.

allows override of asap key server in token utility

Adds a config param startSilent to disable audio output.

If a value is not set in localStorage then null is
returned. null should not be converted to an empty
string (via _.escape) because that will then be
stored in localStorage as the user set preference
and will keep overriding any other values set
in localStorage for the displayname.

They may contain sensitive information.

VideoLayout schedules a large video update by passing in
the video stream on the small video instance. When a stream
is removed, the UI is removed from the small video instance
but a reference to the stream is left. So when VideoLayout
schedules the large video update after a stream removal,
the old stream from the small video instance is re-used,
even though it has been removed.

This change also brings balance with RemoteVideo method
"addRemoteStreamElement" which sets the stream on the
small video instance, so now "removeRemoteStreamElement
unsets it.

- Use actions to notify the rest of the app that
  a mic or camera error has occurred
- Use middleware to respond to those notifications
  of errors by showing in-app notifications and
  notifying the external api

This reverts commit f42d0411b1.

The UX provided by this feature flag in its current state is not
desired. Also, I noticed filmstrip sometimes failing to properly
update small video display mode on pin/unpin. The feature is
being left in for consumers of jitsi-meet to enable as needed.

When in a conference, try to enter PiP when pressing the back button. If this is
not possible (because it's unsupported, not enabled, etc.) fall back to the
previous behavior of simply hanging up.