Fix harvest-type being ignored in digspeed-calculation. This meant that hatchets could break ores the same speed as wood blocks, picks wood with the same speed as stone, etc. #897
Move Creative Tab class to library since it's only used there for the registry.
Fix some armor modifiers being applicable to everything, crashing the game. #885
Fix tanks not emitting light when they have a glowing liquid.
Make the light emitted by tanks proportional to how full they are