avcodec/indeo4: Move frametypes into common header.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/indeo4: Decode both parts of IP frames

Fixes part of Ticket845

av_frame_move_ref() idea by Anton Khirnov

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>