listen to an Options class and manage storage and retrieval from persistent storage.
create a new controller with preferences for the options class.
write the current options out to persistent preferences, so that they will be used next session. The prefs are stored in AUTOPLOT_DATA/config/options.preferences.
load the preferences which persist between sessions into dom.options, firing events as they are set. Note for headless mode and non-application modes, this has no effect.