[DO-NOT-MERGE] PBR based Lighting with support for O-R-M-Maps

[kirides]

• Replaces Blinn-Phong lighting with PBR
• Adds support for (Ambient)Occlusion-Roughness-Metalness-Maps inside a combined TEX_orm.dds file
• Normalmaps also enables ORM-maps

Here's the link to the build where this feature is enabled: https://github.com/kirides/GD3D11/actions/runs/26912350120/artifacts/7396700650

For an up to date build, see the github actions runs of this PR https://github.com/kirides/GD3D11/actions/workflows/build-and-conditional-release.yml?query=branch%3Afeat%2Fpbr

The renderer assumes OpenGL formatted normals (+Y) instead of DirectX (-Y) - Don't ask me why...

Here are some basic normal maps and ORM maps for testing purposes.
Those are generated. They don't look as good or as real as some should. But they should serve for an example on how normals and PBR/ORM interact with each other.

Normalmaps generated using DeepBump (generates OpenGL Y+ normals)

# inside git-bash on windows
> cd C:/extracted-textures/
> for f in *.png; do python3.exe C:/DeepBump-8/cli.py "$f" "${f%.*}_normal.png" color_to_normals --color_to_normals-overlap LARGE; done

ORM generated using custom NormalMapOnline using the provided normals from DeepBump pass.

See here for some Normalmaps: https://gist.github.com/kirides/dbda8d603dc4a6cac461cbc16f8cd238

GD3D11_GothicGame_ORM_World.vdf (BC7)

To install them, just put the VDF into Gothic2\Data\-Directory like any other texture patch.

Ensure NO Texture pack is active. These only work with VANILLA Gothic 2 textures. Any other texturepack will cause visual artifacts and look UGLY.