RAY's 3D Rails

This took quite a while to get my head around.
Finally i added LabPBR shader support via specular maps.

I used LabPBR Material Standard) as a preset for the specular maps and build on it.

The actual values used - if someone is interested - can be found here.
// Note that it highly depends on the shader and their LabPBR settings

Currently specular maps are supported for all textures with 4 variants.

Added:

• LabPBR Shader support // for all existing "4 variants"

Updated:

• Alex's Caves // 4 variants + LabPBR
• Botania // 4 variants + LabPBR
• Create // LabPBR

Fixed:

• Wrong files path for copper models // changed data structure
• RP won't load due to unsupported characters in filename // removed filename colors