"Git Authors" added to local prefs

Allow each lab to configure a set of local authors for the lab.
Preference item auto-updates the "Authors" menu on the Save/Load tab.
"Load Recent" menu contents locally persistent

Preserves local copies of the load recent menu using the preferences
system back-end.  Updates menu at run, saves contents when 'quit' button
is pressed, otherwise no overhead has been added to any operation.