Fixed a small problem with the fife timer library. There was a problem with UH when clicking on certain buttons on the main menu which cased a hang/crash. The timer now stops itself before executing the callback.

<Panel name="errorWindow" title="Error" min_size="300, 100">
	<ScrollArea>
		<Label name="message" text="Error:" wrap_text="1" vexpand="1"/>
	</ScrollArea>
	<Button name="okButton" text="OK"/>
</Panel>