changed: Implement ChapterOrBigStep-actions and make previous BigStep-actions without chapter seeking

Conflicts:
	xbmc/cores/amlplayer/AMLPlayer.cpp
	xbmc/cores/dvdplayer/DVDPlayer.cpp
	xbmc/cores/omxplayer/OMXPlayer.cpp
	xbmc/cores/omxplayer/OMXPlayer.h
	xbmc/guilib/Key.h