add new option to allow Eject key emulation of the Fn key

This allows Wired Keyboard users to press Eject + [function key] and have the same thing happen that what would happen when Fn + [function key] was pressed on a Wireless keyboard. Essentially making Eject the Fn key. However, when this option is enabled, you can no longer toggle FMode on/off using the Eject key (obviously).
update config window with the new option
minor text/formatting tweaks to config window
lets make this config window look a bit prettier and self-explanatory, shall we...
README modifications