GameController:
+ Added buyBuilding stub

BuildingsView:
+ Added purchaseBuilding button

+ Added getBuildingsBox()
+ Added buy_building() stub
+ Prettified BuildingView

+ Created buildScreen method instead of having everything in constructor.
+ Added getPlayer() in GameController
+ Fixed up the InventoryView

- Added the CSS to BuildingsView and TradeView

+ Added SceneButton objects to clean up the Controller

- Deleted obsolete DefenseView.java
- Moved logic from ClientApp to GameController
- Beautified some of the GUI in the views
- Committing to develop as this is not a feature

- Added the inventory view
- Added the map view which is empty but needs to be implemented later.
- The buttonStyles.css dont do anything currently but will be added later.
- Added extra buttons to the scene_select_buttons

- Added Building and Trade Views
- Added supporting functionality in ClientApp.java

- Finalized format of ClientApp.java
- Added skeletons for all the views
- Added functionality for changing views