Add the new function action_enabler_utype_possible_actor() to the actions module. It checks that an action enabler - at least in theory - may be performed by a unit of a given type.
This covers two use cases for me:
The first is auto help for actions that lists all the requirements of an action like extra requirements has. (I'm not yet sure where to put this generated text.)
The second is to purge more action enablers generated by rscompat.