Changelog:
- Improve OpenGL: more pixel formats, supports QML(not stable),
    dynamic gl support etc.
- VAAPI: GLX direct rendering support. check 4k.
- DXVA: more decoding surfaces to improve performance
- VDA (OSX hardware decoding) support
- Android support. Easy to deploy
- Subtitle support, including QML
- Improve OpenAL. Works fine on most platforms including android
- FFmpeg libavfilter support
- Audio output api change
- deploy script for ifw, OSX
- Bug fix
- WIP: dsound, opensl, audio engine, audio filters etc.