- moving filter-related code out of the layercontroller
by creating a Filter subclass : CVFilter
- making coreimage filters available to javascript when running on osx
Note : this is a work in progress and implementation is still unfinished
(coreimage filters won't work in this revision)
the most serious fix here was to flag the cocoa keyboardcontroller as
indestructible, to avoid crashes when loading a new script after a reset()
(the keyboardcontroller was destroyed while still used as a singleton,
so the new script was referencing a dead instance)
