Major changes to render API

[mokiat]

Changes

• Reworks the render API to be closer to modern GPU APIs
  • Ideally this should allow a WebGPU implementation in the future
• Reworks the ui package to use a single shared uniform buffer
  • Leads to a single upload per frame, resulting in big performance boost on some systems
• Reworks the game package to use a single shared uniform buffer
  • Leads to a single upload per frame, resulting in big performance boost on some systems
• Reduces the usage of Triangle Fans, since modern APIs don't support them
  • Ideally they should be phased out
• Moves away from index restarts. OpenGL 4.1 does not support them and MacOS does not allow for newer OpenGL

NOTE: The render API changes are a significant breaking change.