Gives slabs and double slabs an overall better appearance.

Slabs changed:
-Sandstone
-Cut Sandstone
-Petrified Oak Planks
-Quartz
-Red Sandstone
-Cut Red Sandstone
-Prismarine Brick
-Polished Granite
-Polished Diorite
-Polished Andesite
-Polished Blaskstone
-Polished Deepslate

Double slab blocks are changed to add more block types.

Double slabs changed:
-Oak Planks(to Oak Crate)
-Spruce Planks (to Spruce Crate)
-Birch Planks (to Birch Crate)
-Jungle Planks (to Jungle Crate)
-Acacia Planks (to Acacia Crate)
-Dark Oak Planks (to Dark Oak Crate)
-Crimson Planks (to Crimson Crate)
-Warped Planks (to Warped Crate)
-Stone (to Stone Pillar)
-Cobblestone (to Small Stone Bricks)
-Mossy Cobblestone (to Mossy Stone Bricks)
-Stone Bricks (to Stone Tiles)
-Mossy Stone Bricks (to Mossy Stone Tiles)
-Granite (to Granite Bricks)
-Andesite (to Andesite Bricks)
-Diorite (to Diorite Bricks)
-Blackstone (to Blackstone Pillar)
-Polished Blackstone Bricks ( to Polished Blackstone Tiles)
-Bricks (to Mossy Bricks)
-Smooth Sandstone (to Smooth Chiseled Sandstone) (the shape is close to an Ankh, the same shape on desert temples)
-Red Smooth Sandstone (to Smooth Chiseled Sandstone )  (Ditto)
-Prismarine (to Mossy Prismarine)
-Dark Prismarine (to Prismarine Pillar)
-Nether Bricks (to Crimson Mossy Nether Bricks)
-Red Nether Bricks (to Red Nether Brick Pillar)
-Smooth Quartz (to Small Quartz Bricks)
-End Stone Brick (Chiseled End Stone)
-Purpur (Chiseled Purpur)
-Cobbled Deepslate (Deepslate Piller)
-Deepslate Bricks (Mossy Deepslate Bricks)
-Deepslate Tiles (Mossy Deepslate Tiles)
-Cut Copper + Waxed (Copper Panels)
-Exposed Cut Copper + Waxed (Exposed Copper Panels)
-Weathered Cut Copper + Waxed (Weathered Copper Panels)
-Oxidized Cut Copper + Waxed (Oxidized Copper Panels)