Major Performance Update

Puzzle pieces choose their depth on place, not on update.
Fixed update increased to 1 second
Physics only calculate when puzzle pieces are moved
Physics no longer calculate velocity
Puzzle pieces spawn asleep
White flash will not be calculated after it occurred

This improves performance from 52130ms per frame at 65k puzzle pieces to a little under 12ms

--Bonus
Pieces now rotate around the cursor properly
Fixed annoying flicker when moving a lot of pieces
You can now zoom in 8x farther
Puzzle Piece outline in Image Upload preview is now thicker and uses Bilinear sampling
Custom Images now use Point filter mode