Add slabs for blocks like Polished Granite, Concrete #2768
Description
GregTech CEu Version
v2.8.10
Related Problem
Many rock-related blocks in GTCEu do not have slabs, the only slabs in the mod are for Treated Wood and Rubber Wood, unlike rocks in vanilla Minecraft, and often other mods.
Your Solution
Add slabs for many of GTCEu's rocks.
Additional Information
No response