Jesse Duffield 51fb82d6bf 
	
	
	Enforce single-item selection in various actions ... 
			We want to show an error when the user tries to invoke an action that expects only
a single item to be selected.
We're using the GetDisabledReason field to enforce this (as well as DisabledReason
on menu items).
I've created a ListControllerTrait to store some shared convenience functions for this. 
		
	 
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