[release] version bump to 14.0 alpha1
Merge pull request #4316 from MartijnKaijser/14.0a1

[release] version bump to 14.0 alpha1
[language] update strings.po for missing PVR help text
Merge pull request #4313 from FernetMenta/wasapi

WASAPI: increase audio buffer for USB devices, fixes audible distortion
[osxsink] - detect digital outputs based on device name and make capable passthrough devices "AE_DEVTYPE_IEC958" for showing the passthrough options in the gui - fixes missing passthrough options on some special audio setups
[language] fix wrong string meaning. should say "Apple Remote support could not be enabled"
[language] remove unused setting descriptions
Merge pull request #4323 from MartijnKaijser/lang_fixes

Language fixes
Merge pull request #4307 from Memphiz/tvoutnonativekeyboard

[ios] - only use the native keyboard if tvout is not used (native keyboa...
Merge pull request #4320 from Memphiz/osxsinkfinddigital

[osxsink] - detect digital outputs based on device name and make capable...
[depends] move ffmpeg to unified deps
[configure] remove internal ffmpeg
ffmpeg: remove dll wrappers
add ffmpeg lock manager
todo: refactor to own file
ffmpeg: move callbacks into separate file
remove ffmpeg dlls from generated headers
not removing win32 as this might still be needed?
[rpi] setup-sdk.sh: allow overriding of buildroot and xbmc install paths
also don't require root if not needed
add ffmpeg makefile for rpi
[WIN32] download and compile ffmpeg from remote source.
[WIN32] make XBMC compile, build and run with the ffmpeg link libraries.