LPS-32654 Support the automatic storage of fields in the Edit Site form as typeSettings.

This is the same feature as in EditLayoutAction. It makes easier to extend the Sites form: 1) Add a new jsp under sites_admin/site with input fields prefixed by TypeSettingsProperties-- 2) include the jsp name in the sites.form.update.[section] list at portal.properties. The input field values are automatically stored as TypeSettings of the Group.