feat: add model thumbnail rendering

[Lunarient]

Summary

This pull request adds 3D model thumbnail support for .obj, .gltf, .stl, .glb, and .fbx formats, using Open3D 0.19.0 for rendering. It supports textures and can color texture-less models. In the future, I plan to add a setting for users to choose their default model color.

This supersedes https://github.com/TagStudioDev/TagStudio/pull/693

This closes https://github.com/TagStudioDev/TagStudio/issues/351

Remaining Issues

The first issue with the pull request is that Open3D's OffscreenRenderer requires a dedicated thread, and it crashes if no thread adopts the renderer. I'm unsure how to integrate this with QThreads, so as a workaround, I set daemon=True for the rendering thread to prevent the software from hanging on exit. While this stops the hanging issue, it feels like a hacky solution.

The second issue is that sometimes on the first run the program seg faults, but on second run has no issues

Preview

Tasks Completed

• Platforms Tested:
  • [ ] Windows x86
  • [ ] Windows ARM
  • [ ] macOS x86
  • [ ] macOS ARM
  • [X] Linux x86
  • [ ] Linux ARM
• Tested For:
  • [x] Basic functionality
  • [ ] PyInstaller executable

[Lunarient]

Looks like the offscreenrenderer that comes with open3d only works on linux. So I need to try a different way to render off screen. I think there are other ways, they will just take more time. Back to the drawing board

[CyanVoxel]

Closing, see discussion post #1231