Several changes to layer, camera and map dialogs: * Renamed CameraEditor and LayerEditor to CameraDialog and LayerDialog * Moved CameraDialog and LayerDialog into their own modules in scripts.gui so other components can use them. * Prettier camera dialog * Added LayerDialog to map wizard

<Window name="Input" title="Input box:">
	<VBox>
		<Label name="prompt" text="Enter your data:"/>
		<TextField name="inputBox"/>	
		<HBox>
			<Button name="okButton" text="OK"/>
			<Button name="cancelButton" text="Cancel"/>
		</HBox>
	</VBox>
</Window>