P0-A11: Part 992: Beta Testing

I have completed more testing, and fixed quite a few more bugs.

I have added an in-game command console, so that players can input certain commands during the game. This is intended to be used for testing only.

I have also fixed quite a few issues with items and vehicles not being rotated correctly when being placed in the world.

I have also fixed and refactored the inventory system, but further testing is needed here.