Added Display#title

Added a method to the Display class that enables the display of arbitrary text in the title bar of the window. The text is right-aligned with a single space between the text and the edge of the window. Currently displays the user's name, rating & experience.

Signed-off-by: Stewart M. Johnson <stewart@bolidian.com>
Changed to interrupt model for updates.

Fibs now provides the ability to register against different 'subjects' indicating particular events/data changes within the Fibs data structure (implemented in Status). Clients register one or many blocks against each subject.

Signed-off-by: Stewart M. Johnson <stewart@bolidian.com>