Really-not-a-Secret Wednesday Update

Added Mythril & Copper Tools Materials;
Added Mythril & Copper Tools;
Added appropriate Recipes;
Added appropriate Localization Nodes;
Added appropriate textures;
Cleaned up a lot of code, various changes:
- lexpi renamed to expanite;
- lexpo renamed to expaniteOre;
- mingot/cingot renamed to mythrilIngot/copperIngot;
- blockmithri/coperblock renamed to mythrilBlock/copperBlock;
- mithrilore/coperore renamed to mythrilOre/copperOre.