libeplayer3: cleanup unused code

Conflicts:
	libeplayer3/container/container.c
	libeplayer3/container/container_ffmpeg.c
	libeplayer3/include/container.h
	libeplayer3/include/ffmpeg_metadata.h
	libeplayer3/include/playback.h
	libeplayer3/playback/playback.c
libeplayer3: change teletext handling to directly inject packets in tuxtext

Conflicts:
	libeplayer3/container/container_ffmpeg.c
	libeplayer3/output/output.c
	libeplayer3/output/output_pipe.c