Remove Indirect Draws Occlusion Culling

[cwfitzgerald]

Checklist

• CI Checked:
  • cargo fmt has been ran
  • cargo clippy reports no issues
  • cargo test succeeds
  • cargo rend3-doc has no warnings
  • cargo deny check issues have been fixed or added to deny.toml
• Manually Checked:
  • relevant examples/test cases run
  • changes added to changelog
    • Add credit to yourself for each change: Added new functionality @githubname.

Related Issues

Undoes a good chunk of #489

Description

Occlusion culling vastly over-complicated the codebase, had many performance and reliability issues, and was a major roadblock to rend3 getting features.

We still use bindless, vertex pulling, and a single buffer for all mesh data, this just removes occlusion culling.