Add multimedia codecs to FFmpeg, add MLT, add Kdenlive
- had to switch libogg, libvorbis, libsamplerate to autotools, as CMake patch misses pkg-config files for FFmpeg (this is only for GCC like compilers)
- added x264, x265, libvpx for FFmpeg
- added dlfcn, sdl2, frei0r for MLT
- added MLT (+patch) & Kdenlive (+patch conflicting ARM builds)