Removes Milo trying to access damage on items (`nil` because of The
Flattening). We might also need to reimplement showing durability in the
item's display name - I got a little too carried away with removing
mentions of "damage". Also renames nbtHash to nbt to be consistent with
new CC:T naming. I tried not to touch anything related to MiloRemote for
now, and there are probably still many bugs remaining that need to be
ironed out. Most of the basic functionality works now, though.
