Add quicktime in24 and in32 support (basically s24/32l from what i understand)

Add quicktime in24 and in32 support (basically s24/32l from what i understand)
Some testing might be needed

I tried on samples:
 ftp://ftp.funcom.com/media/Dreamfall/final_dreamfall_trailer_funcom_qtmp4.mov
 http://www.movie-update.com/download/11372/sm3_sneak_peek.mov

According to the Mplayer mailing list, there might be endianess issues (i couldn't find s24b equivalent samples ... so i couldn't test). See http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-March/041206.html