Neapolitan PBR

Sorry about the lack of updates throughout winter and spring. School got in the way :P. With more time on my hands now I'm going to work on this side-project more often.

Added in every map for all the 1.16 or earlier blocks I wanted to add for now, including:

• All 13 variants of terracotta (12 colored and 1 default colored, all have the same height map)
• All 12 variants of concrete powder (All have the same height map)
• Magma
• Ice and its variants
• Mushroom blocks besides red
• Coral blocks

I didn't add in any 1.17 blocks, but this pack should now work fine with the latest versions of Optifine that support shaders on 1.17. Keep in mind it uses the <1.17 textures for ores, the compass, and the clock, however

I plan to update and backport those. 

Expect 1.17 blocks to come soon, and expect to see a version for <1.13 soon enough; it might take a while to rename all the files properly for 1.8-1.12.

Also I added in support for 1.13 with this particular revision, including backporting the new textures from the 1.14 texture update.