Making GUIs awesome since, 2014.

- Added TileEntityBase. Not much right now.
- Ported over GuiBase, added localization support.
- Added x3n0 as an author for a bunch of stuff.
- Added CraftingRecipeBuilder. The idea/structure was all from
Unh0ly_Tigg, I just implemented it.
- ItemBlockBase. It’s a lot like ItemBase.
- Cleaned up.
- Added ContentHelper.