[Open Assets] FLATTENING.LUA V3

You can now flatten people with the stone shoe or by falling really really fast onto them
and it now rewards amps lol

I had been working on this in the release candidate versions, since they made and exposed a much needed player variable. (stunned)
Now it should feel more correct, hopefully.
Also a way to toggle the flattening style locally! If you use models only, or just prefer the SRB2K styled sprites, flattening.local.flatstyle 1 is the command you're looking for. (0 is automatic, 2 is forced paper sprite.)

So release version i made the mistake of using the DEAD frame for squishing when a character doesn't have an animation... when i should have just made it behave like SRB2K and squish the sprite! so now it squishes models correctly i guess.