[Continues 68414526]: First 2 levels in progression

Lots of changes here:
(1) add level 1 with a required block of say, a timeout, and enforce it with a new sayComplete > 0 check
(2) add level 2 with a finish marker, a required block of move, and a timeout. dust off old paddleFinish code and rename as sprite0Finish
(3) modify blocks to not use a dropdown when there is only one sprite in the level
(4) no longer center the finish markers, change size to 100x100 to match sprites
(5) make score appear only once a score block executes. add optional showZeroZeroScore param per-level - currently not used.