libeplayer3: remove no longer needed teletext output handling

Conflicts:
	libeplayer3/container/container_ffmpeg.c
	libeplayer3/include/output.h
	libeplayer3/include/playback.h
	libeplayer3/manager/teletext.c
	libeplayer3/output/output.c
	libeplayer3/playback/playback.c
	libspark/playback_libeplayer3.cpp
libeplayer3: more cleanups

Conflicts:
	libeplayer3/include/misc.h
	libeplayer3/include/playback.h
	libeplayer3/manager/subtitle.c
	libeplayer3/playback/playback.c