P0-A6: Part 728: AI, Art, Dynamic Story

I have made some additonal improvements to the AI, as well as the inventory and item management features.

I have also added a system that hides the terrain surface when the user enters a building that protrudes below the surface of the terrain.

The next part of the project is to work on an AI dialog system, to allow for voice and text best communication with an AI entity. I want to be able to use voice output for immersion, but have text output as a backup.

The user should also be able to use voice input and output too, and allowing the user to choose between dialog options visually will require some changes to the controls of the game.

I have also done a little work on my art project. I intend to finish this in the next week or so.