Unused Mineral Blocks

Improves the mineral blocks by going back in time!

Basically, this restores the 1.14 texture overhaul's unused mineral block textures (Diamond, Lapis, Gold and Emerald blocks). The Diamond, Lapis and Emerald blocks are from the first public bets textures and the gold is from the second. Also, it reverts Obsidian too.

This is my first project on CurseForge so let me know what I can improve! :D