TerraFirmaThings

Some small tweaks based off suggestions:

-Allow gem displays to give off a redstone comparator signal based on how full they are. Full = max signal, empty = no signal, partially full = signal length proportional to how full it is.

-Moved various tooltips to translation keys in the lang file. (If you wish to translate this mod, feel free to submit a pull request with a lang file on this mod's github!)

-Added colors to the sharpness tooltip where the current color represents the level of sharpness on an item. Green = level 1 (0-64 charges), Blue = level 2 (65-256 charges), Purple = level 3 (>256 charges)

-Fixed out of bounds error when trying to remove a gem from an empty gem display.