Extend MPEGExtractor to support "qt" type

1. Check if the major brand is 'qt ' in box 'ftyp' to support quicktime mp4 clips;
2. If there are some invaild data at the end of one box, skip them and keep parsing.

Change-Id: I4433c6262cd627f3446e011f32cdfd164642b815
Author: Weian Chen <weian.chen@intel.com>
Signed-off-by: Weian Chen <weian.chen@intel.com>
Signed-off-by: Mingfei Bao<mingfei.bao@intel.com>
Singed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 48862, 18544, 10568