Extra Rocks

Added 3 new things..

• Cobbled Greywacke; comes with stairs, slabs and walls like others.
• Stairs, slabs and walls for Basalt, Calcite and Dripstone. No polished or bricks variants.

Ash

• Ash - A block that when hit by a projectile of any sort will break. It also has gravity.
• Compact ash - Similar to ash but it has no gravity in case you wanted to build with it.
• Loose ash - Similar to compact ash, but when stepped on, after 1s it will also break.