Countered's Terrain Slabs

• fix snow and vegetation on top disable option
• fix quark greener grass
• fix Sodium / Embeddium snow & vegetation on top

The following fixes don't apply when using Sodium / Embeddium yet:

• fix slab ambient occlusion + setting
• fix snow ambient occlusion

• fix snow and vegetation on top disable option
• fix quark greener grass
• fix Sodium / Embeddium snow & vegetation on top

The following fixes don't apply when using Sodium / Embeddium yet:

• fix slab ambient occlusion + setting
• fix snow ambient occlusion

• fix Distant Horizons crash

• fix Distant Horizons crash

• partial rewrite & native forge port