MP1-4258: Due to the latest rework a possible freeze no longer occurs and the BeginInvoke calls in NowPlaying can be changed back to Invoke
MP1-4258: Unplug the source channel from the mixer, before a new mixer is created, to avoid possible crashes
Merge remote-tracking branch 'remotes/upstream/MP1-4258-BUG-BASS_should_raise_g_player_events' into 1.5.0Fork

Conflicts:
	mediaportal/WindowPlugins/GUIMusic/GUIMusicPlayingNow.cs