extend libdvbsub to handle ass subtitles

Conflicts:
	data/locale/deutsch.locale
	data/locale/english.locale
	lib/libdvbsub/dvbsub.cpp
	lib/libdvbsub/dvbsubtitle.cpp
	src/gui/movieplayer.cpp
	src/gui/movieplayer.h
	src/gui/osd_setup.cpp
	src/system/locals.h
	src/system/locals_intern.h