leave the room if focus left

LargeVideo: detach previous stream when attaching new one

Fix watermark logo blinking during video switching

fix authentication dialog

Remove old track from the conference before adding new one

Fix screensharing mute on safari

Allow user to select camera and microphone

Handle video mute/unmute during screensharing

handle FOCUS_LEFT conference error

Fixes shifted audio level glow on thumbnails. Fixes missing audio level indicator on large video avatar.

Commented part seems not to be required anymore as everything work well without it.

Removes duplicated logic for hiding video element when the user is muted.