Improves mouse events for the events-based project template.
This includes a View class that:
1) Mouse events only get sent to the control under the mouse
rather than all controls on the view
2) Elements will get Focus/Unfocus messages as the mouse
moves in or out of their bounds
This gives an option for creating a project where the event
handling is centralized in a single processing loop, and is
then dispatched to 'views' that contain the game logic.
Like the original skeleton engine, the created events-based
engine contains a single default view showing a palette cycle.
