block_catcher.py - basic version
block_catcher_scorebar.py - addition of a scorebar surface at the bottom

Demnstrates multiple groups of different sprites, and collisions between them.
Not all Sprites need to move, as this example shows.  Pygame's built-in
collision handling was used here, demonstrating how simple it can be to detect and
handle collisions with Sprites in the same group, or in other groups.

The added scorebar version includes multiple surfaces, which requires some extra care
with positioning of objects.

Both examples also show the use of Font objects that are constantly changing.
