added interface for setting the master Context to something other than the default. Added some docs, refining when XAudio is enabled
removed all wasapi usage from ContextXAudio, begin DeviceManagerXAudio
working stripped down ContextXAudio
moved xapo stuff to test app
trimming the fat
pull samplerate / channels from mastering voice
removing xapo lib's from audio2.lib
correcting preprocessor settings and checks for different xaudio2 versions