[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

See for example the highlights of the Roofs in Khorinis city with the attached normals and ORM-maps.

Here are some sample textures compressed with texconv.exe -f BC7_UNORM *.png

Normalmaps_0.zip

To see it in action, put all the files inside this Zip-file into Gothic 2\System\GD3D11\Textures\replacements\Normalmaps_0\

> tree . /f
B:\D\SPIELE\GOTHIC 2 GOG\SYSTEM\GD3D11\TEXTURES\REPLACEMENTS\NORMALMAPS_0
    NW_City_Roof_02_normal.DDS
    NW_City_Roof_02_orm.DDS
    NW_City_Roof_04_normal.DDS
    NW_City_Roof_04_orm.DDS
    NW_City_Roof_05_normal.DDS
    NW_City_Roof_05_orm.DDS
    ....

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

You can use the following tool, modified from https://github.com/crazytoolsteam/NormalMapOnline/ to generate basic PBR maps.

NormalMapOnline-main.zip

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