Refactored and cleaned up Model and Test projects

Bomberman/Model/BasicMonster.cs

Bomberman/Model/Bomb.cs

Bomberman/Model/ClumsyMonster.cs

Bomberman/Model/GameModel.cs

Bomberman/Model/GameModelLayouts.cs

Bomberman/Model/GhostMonster.cs

Bomberman/Model/Monster.cs

Bomberman/Model/Player.cs

Bomberman/Model/SmartMonster.cs

Bomberman/Model/StackableEffect.cs

Bomberman/Model/Utils/ActionEventArgs.cs

Bomberman/Model/Utils/Direction.cs

Bomberman/Model/Utils/FieldChangedEventArgs.cs

Bomberman/Model/Utils/IntEventArgs.cs

Bomberman/Model/Utils/LowerFieldType.cs

Bomberman/Model/Utils/MoveEventArgs.cs

Bomberman/Model/Utils/NewRoundEventArgs.cs

Bomberman/Model/Utils/PlayerEventArgs.cs

Bomberman/Model/Utils/PlayerStatusEventArgs.cs

Bomberman/Model/Utils/PlayerType.cs