Simple Crafting

To test out the functionality of the core game engine, some kind of actions and game state is needed.

A good place to begin could be to implement basic crafting, where one can use things like stones as simple tools to build more complex tools and gather new raw materials.

Using this module should not rely on any spatial world model being present, just an 'accessible environment' (objects that are within 'hands reach') that can contain the objects in the test world.

Using a tool should take some time (and possibly consume some energy - that will be used later with metabolism modules and such, but it might be good to design in at this time, perhaps with a simple energy level system).