v0.1.1

• Fix Camera.ScreenToWorldPos() bug
• Fix Animation.Draw() bug
• Fix UIElement Width and Height setter bug
• UISprite now implicitly copies Animations
• AnimationStateMachine now automatically removes non-looping, complete Animations from the queue
• Timer.Start() won't create duplicates if called when already running
• Add SceneManager.RemoveScene()
• Update Demo MonoGame dependencies