Decoding to bgr15/16 from 16bit input. Decoding of 24bit input added, not yet...

Decoding to bgr15/16 from 16bit input. Decoding of 24bit input added, not yet finished, but at least the picture can be recognized


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3488 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b