GSOC: Caverns & Chasms Patch

Spinel ore variants

Andesite Spinel Ore, Diorite Spinel Ore, Granite Spinel Ore, Tuff Spinel Ore

New Silver Textures

Silver tools, soul silver ore, silver bars and medium weighted pressure plate

Spinel items

Rough Spinel Shard, Rough Spinel, Spinel Shard

All textures as of 1.3