Adapted rio_do_hola to use the new SoundManager. Fixed a bug in the sound manager that caused a sound to not be looped if it did not have a callback assigned to it. Looping a stream using timers doesn't loop perfectly. I'll fix this in the future.

<HBox opaque='1'>
	<Label name="Title" text="Rio de hola - FIFE 0.3.1"/>
	<Button name="quitButton" text="Quit"/>
	<Button name="aboutButton" text="About"/>
	<Button name="optionsButton" text="Options"/>
</HBox>