Authentication buttons no longer belong to the Toolbar.

If we:
 - pin a remote and click it, unpin is signalled.
 - pin a remote and the click another remote, the new one is pinned and signalled.
 - pin a remote and then click local. UI pins local, but unpinning remote is not signaled, fix addressed with this commit.
 - pin/unpin local, nothing is signalled.

It was not switching and staying on local video on unpinning, after change the last shown video will be used to switch to it.

Prevents the close button to take focus while user clicks tab in the page, which will privent the toast to be closed.

We used to stop player updates on self presence received, so between stop and self presence we can send a playing update which will provoke adding the video again to other participants.