Adding Bygone Age and Fossil Hunting mods

Adding both, Bygone Age and Fossil Hunting mods, to the project. There
are located at src\main\java\com and src\main\resources\assets folder.

- Note: Fossil hunting must be revised before merging anything. I would
say that only the tools can be merged right now. Most of the fossil
models are in .obj format and the model class is far from optimized
(this was my first big mod, so don't expect some fancy things, haha).