[Azoth] Check for double-adding calls.
[Azoth] Removed unused CallManager::gotCall().
[Azoth] Detect double-emitted calls.
[Azoth] Properly handle out calls in CallManager.

They will be emitted via called() anyway.
[Azoth] Properly handle out calls in ChatTab.

They will be emitted via called() anyway.
[Azoth Xoox] Emit outgoing calls as called().