Made filter aware of what bounds it processes (WIP)

1. FragmentFilter activate() and deactivate() now uses
FragmentFilterContext to pass all the things necessary for rendering.
2. Calculate bounds now taken one more parameter used to hold object
bounds in the space currently used (stage or local), resultRect was
changed to textureBounds.
3. New method was added to FragmentFilter: adjustBounds() which may be
used to change texture and object bounds used in processing.