Core Update, more mod compat.

Updates to Core take advantage of new Equivalency API for mines and
Items, as well as new ISimpleItemTypeAdapter for serilizing mines into
Json. Current set up seems to not only work but be fully backwards
compatible.

Added compat for TSteelworks, disabling their limestone and registering
ours in ore dict.

Make Thaumcraft plugin 90% less stupid. I don't know what I was thinking
when I wrote what I did. Forget aspects and biomes, just gen like any
other ore.