[mp-installation] Added profile/avatar access setting

added a division to list rooms with unread messages

Verify avatar from url is image and report errors to the client

Fixed: User leaving channel showed message for join. Closes #1287 

webrtc: fix deprecation warning 'MediaStream.stop() is deprecated'

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Also add beta announcement for host/provisioning.

Avatars from url

Fix tabBar message search

Sandstorm port 001

Conflicts:
	server/configuration/accounts_meld.coffee