Made the data maps not publicly writable by using the new Manager class. All data from JSON is now obtained using this class which is a static property of LastAdventures.
Save File keeps track of current planet, and DisplayUniverseController initializes character to a planet
Transaction now takes in a player and Planet, ship's cargo is now gettable and modifiable.
Beautified the universe generation and display. Note that ship ranges are waaaay inadequate for these planet distances.
Streamlined the data manager class and added key constants to data types.