- Fix inverse matrices (actually) ...

- Fix FOV calculation
- Fix issues with projection function
- Make projection function impossible to read
- Fix bounding sphere calculation
- Implement and enable frustum culling.

- Added object collections ...

- Changed demo rendering to cube
- Enabled backface culling
- Fixed frame drops due to lines going offscreen
- Optimised 2d triangle rendering

Implementation of: ...

- Face normal calculation
- Vector angle calculation
- Restructuring of how faces+objects are stored