Documented FieldModel.
Fix FieldModel using deprecated method.
Documented and cleaned up BrickModel.
Documented and cleaned up FieldEventType.
Documented and cleaned up FieldEventListener.
Documented and cleaned up BrickHelper.
Documented and cleaned up RandomHelper.
Documented and cleaned up State.
Documented and cleaned up Difficulty.
Documented and cleaned up MenuController.
Documented and cleaned up GameController.
Documented and cleaned up SharpMemory.