Combined textures wasn't a thing in S3, it appears to be added in S4. The new shaders use the same guid, therefore replacing them with existing ones in the engine will destroy anisotropy on other characters hair since those anisotropic and thickness textures are mapped out differently. Renamed the pixel shaders and shader sets by suffixing them with 'comb' make sure we don't overwrite the existing one,w hile indicating its the version for combined textures. This allows us to port other characters and models without interfering with the game's currently existing shaders and shader sets.
Repak had a bug where in some cases there won't be a permanent mip, the smallest one will now always be permanent to ensure there's at least 1 permanent mip. If we have a texture without a permanent mip, the engine will fail on ID3D11Device::CreateTexture2D.
