Added Notification Badges to the overview items.

[wvdvegt]

This patch adds notification badges to the overview items.

One small issue I have not solve yet is that one may need to visit a character tab for EveMon to generate the notifications (and badges to popup). I just could not find what code to call to generate them from withing the overview screen.

To be more Specifically this is about only the initial update (when no character tabs have been visited yet).