Add Mystcraft pages for more common blocks

[ProjectGearBot]

The mod is adding CraftTweaker support for adding new blocks as pages. It should be out in the next update. I'd like to add: -Quark stones -Project Red stones -Traverse stones -Slate -Smooth brownstone, smooth seared stone, dried clay -Slime dirt, slime grass -Terracotta, stained terracotta, red sandstone, all sand types -Random Things' colored grass -Botania grass, metamorphic smooth stone, metamorphic cobblestone -Natura grass -White sand, white sandstone

[TheDeviantCrafter]

Actually, there's no way to replace just the topsoil as far as I can tell. Grass blocks like natura grass will cause problems since they will all decay and cause tons of block updates. Sand is a bad idea because mixing falling blocks and floating islands is just begging for a crash.