Allow changing the subpicture filter chain at runtime. (This currently kind of segfaults some of the time (after 2 changes) ... somemore bughunting is needed)

Add calls to config_Put* to make sure that the configuration values survive a filter instance destruction.

Don't use stupid dirac patch.

New erase video filter (to remove logos). Example command line: ./vlc --video-filter "erase{mask=/home/dionoea/images/cone-small.png,x=50,y=50}" --no-audio --color -v -I rc ~/media/redefined-nintendo.mpg