Neapolitan PBR

Just an update with a small amount of changes; I simply decided to add normal maps to netherite armour as those can now be used with a new shaderpack called Voxlementary, as well as realizing that I hadn't added anything for bells, I gave them a model I genuinely feel proud of as well as specular and normal maps. 

Lastly, I decided to give some of the villager professions specular maps (mostly so that their metal tools look metallic), then parsed through the remaining textures to see if I could add anything else I might want to change; I ended up adding specular maps for potions and experience bottles.