P0-A8: Part 835: Debugging

The variable time of day code is now working.

This took a lot of time, but it worked out well, and seems to be reliable. It also adds a lot of realism to the project.

I am now working on more bug fixes and improvements.

I have also fixed some issues with the velocity limiter. When travelling at high speeds close to a planet, it was possible for the player to pass through the surface of the terrain.

This is now mostly fixed. I have also made various other improvements to the lighting and shadows, and fixed some more bugs.