Handle Railcraft v7 versus v8
Revert "Update to use mod textures for Natura and Chisel mods"

This reverts commit 234f516b34bf310b5c086b80568788c3b508b348.
Switch Natura back to using internal textures
Band-aid up Chisel mod config errors - this support needs a lot of work....
More Chisel mod bandaid patches - really needs a rework....