Added more Ruaumoko files

Didnt get all of them the first time around - I think this is all of
them
(DynamicPlaneSculpt.cs) Added sphere dig in addition to digging a full
cylinder.
(DynamicPlaneSculpt.cs) added GUI (although its commented out)
(Sculpter2D) Added raycast dig, zeroing of x axis of dig, and sculpting
across game objects