Merge pull request #4637 from Voyager1/fix-trac15163-bis

[fix] make sure video playlist is empty and current when starting video disc
Merge pull request #4623 from FernetMenta/background

Revert "[WIN32] changed: set background mode when minimized. prevents sc...
version bump to 13.0 final
Revert "[osx] drop outputbuffer index and iterate over them all"

This reverts commit b9a1d07a7d1a2bec3bb094b97cc7d96a325b9b98.

Conflicts:
	xbmc/cores/AudioEngine/Sinks/AESinkDARWINOSX.cpp
[darwinsink] - use fixed outputbuffer with idx 0