Asyncify source handlers
Cleanup source handlers/managers, make INCC
Update Tempest to fix NUnit
Rename InputManager to InputHandler, more consistent
Add mock settings provider
Move MockModuleFinder into public
Add IAudioEngine.Clear
Band-aid disconnect/talking race condition
Start setting up audio
Fix exception removing sources
Move client.CurrentChannel to .Channels.Current
ISourceHandler should declare INCC
Temp disable redirection
Fix ConnectAsync to include all connecting work

Fixes an easy to run into race where a join message gets sent before the
gablarski connect message gets sent.
Fix PTT