[Azoth] Documented ISupportMediaCalls.
[Azoth Sarin] Throw UnknownFriendException, more specialized.
[Azoth Sarin] Added missing string.
[Azoth Sarin] CallManager::AcceptCall().
[Azoth Sarin] emit called() on outgoing calls.
[Azoth Sarin] Handle thread startup.
[Azoth Sarin] Handle incoming calls.
[Azoth Sarin] Hadle incoming audio.
[Azoth Sarin] Handle incoming audio frames in AudioCallDevice.
[Azoth Sarin] Implemented AudioCallDevice::bytesAvailable().