Additional QoL level editor features

[Blaz]

This is an excuse to make even worse rollers than the ones on PR3

Block Fill sounds like a terrible idea. It would likely crash your game because LE is trying to fill every single space a block can go.

to clarify on pizza's part, the block fill in pr3 he based it on and the one he's talking about would have an inherent size maximum, it's not just a paint bucket tool, it's based on the shape you make
also pr3 handles it just fine, i've never once crashed, let alone lagged (even when making ma4) when filling massive areas with shift boxes. it'd work just fine, if there's any way to put it on the... interesting engine jiggmin's created