Adding Mechanism for Dragging Filter and Filter-Event Collision Handling

Create a "red" filter that can be dragged onto the conveyer belt. Once the Filter has been placed onto the conveyer belt, player should press a "Go" button on screen and 2 events should be generated at the source and move down the conveyer belt (1 red event and 1 blue event). The red event should be able to pass through the filter through the destination, the blue event should disappear on contact with the filter.