New AI for Mobs

[xoft]

I meant specific component classes, not actual component classes.
For example, the cFallingBlock needs a unique interaction with the world - when it hits a solid block, it either reintegrates as a block or drops as a cPickup. The cPickup needs a unique interaction with pawns - it can be picked up by them (this might be useful, though, as cExpOrb uses the same code for collection)

I think it might be best to componentize cPawn for now (and keep the cPlayer descendant), and if we ever want to componentize anything more, we'll move it "under" the cPawn.