P0-A6: Part 730: Art, Items, improvements

I have added some new items to the project, including weapon items and navigation items.

The weapon has the ability to apply context-sensitive damage (using sendmessage) to the objects that they hit.

The navigation items allow the player to locate objects in the world by using relative bearing angles. If the player is facing the item, the device shows a high intensity signal, if they are facing away, it shows a low intensity signal. This requires a little more skill to use than a simple compass, and would work when the player should not know exactly where an object or building is.

The next step is to improve the AI, and add more actions.