Adds all passed unit groups to the collection. If the name of a group is already taken, the old group will be overwritten by the new one.
the unit group's to add
Removes any unit group whose name matches one of the passed strings.
the names of the unit groups to delete
Removes any unit group whose name was not passed as an argument.
the unit group's that shouldn't get removed
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Editor of a Collection. Provides methods to add, remove and overwrite unit groups.