Quick links to the wiki.

- The "$CreateSettingElement" will now look for an URL in the "help"
  property to add a link to a page which contains more information about
  the option.
- A new localized string has been added: "SETTINGS_HELP_ABOUT". The
  "option" placeholder can be used in the string to include the label of
  the option: "Help about {option}."
- Added links to the wiki for each option that has already been
  documented.