Material Library fixes

[Markemp]

Materials Library improvements update. I've finally figured out the way that Cryengine handles materials, so this update removes all the hacky code that attempted to simulate how (I thought) it works and more correctly uses the mtl file to determine the materials needed in the model. Also updated the project to .Net 6/c# 10 to take advantage of the performance and readability improvements.

• Update libraries to use .net 6.
• Update material handler to properly determine materials.
  • NOTE: If you have automation that deals with materials, this may break your process. The app is much more dependent on the material library (mtl file) being discoverable. Otherwise it creates default materials with non-specific names.
• Flatten out namespaces to improve readability (not on all files yet).
• Change chunks to sealed classes (or records) where appropriate for performance improvements.
• Updated Collada exporter to better handle materials.

[Markemp]

Will you be testing edge cases, like when SC lists multiple material files? (As seen in the Cutlass Red model...)

It should handle multiple material files without issue, but I'll add some integration tests for the Cutlass Red.

[Markemp]

Found the bug with the Cutlass Red. Probably affected a lot of cryengine models with the geometry file.