Add parallax occlusion mapping

[HeroRyker]

Please add an option for POM it makes the texture packs so much better.

[ColdIce1605]

Sorry, but POM is a shader pack feature what your looking for is normal textures and maybe in some weird format a specular texture, also used for PBR in many cases tho isn't strictly needed, (Chronos is a good example or anything the hardcoded IDs)
It must be noted that Chronos would still need the feature above for POM

[IMS212]

Duplicate of #130.