example code for a lightbar main menu

I hacked this little piece of code by looking at some of the modules that already use a lightbar menu and built from that. I'd say it is not perfect or may not be everbody's personal taste. But it may be used as some sort of 3rd party extension or basis for other, custom lightbar menus. I kindly ask permission to merge this into the main branch. A demo of the code runs on on x84.ufud.eu:6023

If there's any reason to reject this request, please let me know so I can do whatever I can to make it comply to x/84 development standards.

Kind regards,
megagumbo