Falkers Art Deco

- added deepslate set (22 models)
   - raw, cobbled, polished, bricks, tiles, cracked, chiseled and reinforced
   - separate textures for stairs, slabs, double slabs and walls
- added granite, andesite and diorite sets (15 models)
   - normal and polished for all three
   - separate textures for walls and polished stairs and slabs
- new interface elements
   - title and buttons
   - pack icon
   - hotbar and exp bar
   - boss bars
- added new painting ("Mining Heroes")
- changed grass
- copper upper and lower slabs won't connect to each other anymore