Shader Pack v 1.8

Hello everyone!

A lot of cleanup and changes with this pack.

3 major changes now with this.
1: A bunch of fixes to the detail normals and the shader pack itself (no more unsupported shaders included).
2: Added a slider called specular bleed through that will let the shader "pierce through" shadows at a 0 to 1 scale.
3: Added version numbers. If it does have one in the editor, it's not the most up to date! Otherwise it should match this release number if I don't mess up updating it.

As always, feel free to let me know about errors, specific requests, and anything else.

(Amended update - Detail Normals fix, version should read 1.8b)