[mod] properly use CONTAINER_SIZE in frame_container.cpp, add slot for
preprocessed image
[mod] refactoring: sp_player uses frame_container as input
[mod] use correct modulus for frame_container
[mod] refactoring: sp_dct uses frame_container as input; cleanup of deprecated
class members
 [mod] refactoring: sp_hmm uses frame_container as input
[mod] use new interfaces in SPTrack