Lab 10: Refactoring a project and adding functionality to a project with
        numerous classes 

Goals:
- Refactor a relatively large project
- Design solutions that involve a project with munerous classes
- Develop (analyze, design, code, test, document) more sophisticated programs

Refactor the Zuul project to have an Item class and a Player class.
Use these classes to implement the functionality described in section 7.12.
Each room must be able to hold multiple items.
The player can pick up an item from its current room.
The player can later drop this item in a(nother) room.

Make sure you create test classes for your new functionality.
If there are application (game) functionalies that are not easy to test 
via a test class (because of the interactive user interface, for example),
the tests for these functionalities must be documented in a test suite.

Your code must be documented and you must generate Javadoc documentation
that includes all your classes and any methods that you have updated.

Extra credit: Implement a Backpack class. The player can use a backpack to
carry (hold) multiple items.

Double extra credit (when completed this week): Implement a TransporterRoom
class as described in problem 7.46.