Feature: Ramp support

[MJacred]

Basically simplified stairs

[FabriceCastel]

To work around this, for now I've just been creating blocks, and then use the edge tool to overlap two of the top edges, turning the thing into a ramp. The resulting geometry isn't as simple as it could be, but it seems to work.

[blackears]

If you drag vertices on top of each other, they'll automatically merge. Probably the easiest way to create a ramp. I've been thinking of rewriting the stair tool since it creates to many blocks, but that will have to wait for the next big overhaul of Cyclops.