Master merge v1
Merge branch 'master' of https://github.com/Tinob/Ishiiruka
some merges from master
some code cleaning and fixes in windows audio back ends
rework audio output pattern to make sound pleasant event in low framerate conditions.
update soundtouch library to the latest version
enable dlp2 output for the backends that supports it
small fix for dx11
added option to enable time stretching