[Open Assets] PiSRB2 Air Drill v1

This is great! I love the new Drop Dash part you added, and... the... - anyway, I love everything about this! Simply outstanding! So great, that I'm having a lot of trouble describing how great this!
(I wish this'd be a part of 2.3)

genuinely a very unique and equally fun take on the infamously mediocre move hidden in srb2's source code. the drop dash especially, that adds so much substance to the move than what there already is.

only real issue personally (and it is really a personal thing) is that it's way too easy to automatically rebound off a wall if you're next to one and you try to airdrill. other than that, high quality stuff.

Welcome to releases!