v5.5.6 Beta #18

*Robit GUI closes when "go home" called.
*Refactor multiblock inventory system to use only 1 map.
*Better-balanced recipes.
*Metallurgic Infuser now has a purple side by default.
*Configurable generation for MekanismGenerators.
*isAirBlock() instead of explicit id == 0 check.
*doubles instead of ints.