Refactoring to reduce coupling

[tommyah]

As of now the system has various degrees of coupling. Controllers access the model by using an internal reference, which is injected from the main class. This should be replaced with a more generic and flexible system, such as the pub/sub system already in place.

Additions to consider:

• More use of pub/sub, less direct dependency injection
• Universal search widget used multiple places
• Refresh logic for various controllers (refresh in superclass?)
• Method for wiring buttons to actions in view element superclass
• Tweak "TopBarController.setMarketIntegration()" to act more universal
• Show playerstatus in top bar
• Change color of top bar
• Change graph, buttons and text in financial summary
• Refactor unit testing, write new unit tests for various classes
• Make sure every class has appropriate JavaDoc
• Package-info.java files in every package