- Removed the skip_prompt, menu_exit_ob and menu_exit_fn for now. These
  were remnants from version 1 of the text menu system.
- Removed the build_sub_menu function from the MENU_BUILD library. This
  was also a remnant from version 1 of the text menu system.
- Tested the FUNCTION_CALL option for MENU_ITEMS. It now works and
  should be used to create sub-menus.
- The delete character option has temporarily been removed from the
  login menu.