Allow setting one of a person's names as the primary name

[DavidMStraub]

Implementation notes, if someone wants to take this on:

• Add an appropriate button to GramsjsNames.js
• Add a handler method to for the button click that fires an edit:action event
• Add the code that handles the event to handleEditAction in GrampsjsViewObject.js
• The final person object that will be sent to the API via PUT needs to have the new primary name under primary_name and the list of the other names under alternate_names.