Coordinate system in renderer

[heinezen]

Use the coordinate system to freely convert input/world/scene positions.

• Decouple coordinate types
  • scene coordinate type for renderer
  • convert phys to scene
  • convert input to phys (with camera matrices)
• Use coordinate system in new engine components
  • scene for renderer positions
  • phys in gamestate
  • input in input system
• Store game entity positions in component
  • continuous curve for positions
  • send curve updates to renderer
• Documentation
  • Coordinate system
  • Renderer
  • Input system
• Tests
  • Curve (sync)
  • Keyframe container (sync)

Misc additions:

• Support zooming for sprites
• Move a lot of sprite calculations to the shaders
• Enable depth testing in terrain and world renderers
• Flip camera direction and align calculations with how they work in other OpenGL tools like glm
• Fix index buffer generation for 3D terrain

Depends on #1501

[heinezen]

Supercedes/Closes #1380

[heinezen]

Resolved by #1515