Add video streaming project target; removes ffmpeg/kxmovie from our critical path

- Added a new target called iGCS-video-streaming where the kxmovie and ffmpeg
  dependencies remain.
- Add VIDEOSTREAMING compiler flag to iGCS-video-streaming target
- Remove all kxmovie and ffmpeg dependencies form the main iGCS target
  so that we can continue development while we work to get kxmovie and ffmpeg
  compiling again without needing to maintain multiple branches of the project.