moving the ffmpeg branch to historic
Patch by mvbarracuda:
 * Cleaning up branches/historic to save project space (FIFE currently occupies 5GB of space at codesion.com)
 * Removing older branches that have been already merged to trunk
 * Some key branches that haven't been merged with trunk are kept, so they can be revisited at some point
 * Stripped out clients/demos if they haven't been modified for the branch to save project space