P0-B8: Part 1408: Debugging, Improvements

I hae added some new items to the project, such as night vision goggles, and made some further improvements to the items.

I have also fixed several bugs, including some isseus with physics and raycasting that were hard to track down.

There is still an intermittent bug with AI pathfinding that I am trying to solve, but it doesn’t seem too serious.