Implement weapon engineering system

[saricden]

We're going to implement a feature which leverages the new Item class (#63) and inventory system (#61).

The primary function of this feature is a game mechanic which allows you to mix and match raw materials you find in the field, bring your combinations to our Engineer class (#49). He will then trigger a timer, which forces the user to wait an hour (of in-game time, issue #x), after which time he will have a new weapon created for you based on the materials you bring him.

Potential implementation:

• 1) Each material instantiation of Item receives a materialStrength property (visible to player), along with a materialType
• 2) materialStrength can be level 1 - 5
• 3) materialElement can be 'Fire', 'Water', or 'Electricity' (1 - 3)
• 4) materialType directly corresponds to the part of the gun it will be transformed into
• 5) To create a gun, players need to bring one of each of the following to the Engineer: energy source (explosive or electric or others?), pipe/tubing for barrel, grip material.
• 6) The Engineer will make guns based on the materialStrength of each component (1 - 5) and the element (1 - 3). Each gun will consist of it's projectile system (energy), barrel (pipe/tubing - accuracy), and grip. Each component has a total of 15 possible visual representations (and possible function differences), one for each materialElement at each level of materialStrength.