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

<Panel title="Elevation Editor">
	<HBox>
		<VBox name="Metadata Properties">
		</VBox>
		<VBox>
			<Button name="layerButton" text="Edit Layer"/>
			<Spacer /> 		
			<Button name="closeButton" text="Close"/>
		</VBox>
	</HBox>
</Panel>