* Fixed the clear screen problems. The screen is now automatically cleared every frame by the engine if there are no maps loaded. In the process I removed the setClearBackBuffer() function from the RenderBackend.

<HBox opaque='1'>
	<Label name="Title" text="Rio de hola - FIFE 0.3.2"/>
	<Button name="quitButton" text="Quit"/>
	<Button name="aboutButton" text="About"/>
	<Button name="optionsButton" text="Options"/>
</HBox>