Copper and Caverns

Removed a lot of (lackluster) features and rebranded to Copper and Caverns. Sort of genericizing the mod so that it works better in modpacks. Currently adds exactly three things:

• Copper (to balance progression)
• Caverns between y=24-48 (and modified ore distribution to accomodate)
• Cherry trees in forests

• Slightly lower iron ore generation so it's harder to get.
• Add copper armor (replaces chainmail).

Pretty sure that's all I added...

The Minimum Viable Product.

• World is only 1 biome (a plains biome that is modified to spawn oak and cherry trees). Terrain is heavily simplified.
• Stone tools are replaced with copper tools, slightly elongating the progression and requiring you to hold onto wooden tools for a bit longer.
• Beneath the surface is a thin crust with copper ore. Beneath that is a large, dangerous cavern with iron, diamonds, and other valuables.