- IH_STANDARD no longer has a default prompt string informing users
  their character is being created.
- IH_TEXT_MENU now pays attention to the menu_exit flag.
- The function hold_name in CHARACTER_D and its API has been replaced by
  reserve_character_name.
- CHARACTER_D now triggers events regarding players logging in, players
  reconnecting and character creation.
- The function create_character in CHARACTER_D has been rewritten.
- Input handling has been rewritten in the ACCOUNT object (again).
- Users may now create characters via the login menu, though they cannot
  be deleted yet.