BlockState breaking the API

[NiLSPACE]

This might be a long shot, but can we replace all E_BLOCK_XYZ global variables to have a blockstate variable instead of the integer we have now? I'm not sure how we would handle nibbletypes with that though.

Something like this in manual bindings:

tolua_constant(tolua_S, "E_BLOCK_AIR", Block::Air::Air());
...