public FSRL getLoadableFSRL() {
		FSBNode node = getSelectedNode();
		return node != null ? node.getLoadableFSRL() : null;
	}
Returns the FSRL of the currently selected item, if it is a 'loadable' item.

@return FSRL of the currently selected loadable item, or null if nothing selected or
more than 1 selected
Ghidra/Features/Base/src/main/java/ghidra/plugins/fsbrowser/FSBActionContext.java