FSA model for widgets

[Johannes Schaback]

Hi Esa and the rest! :)

Just a quick warning not to start on the transition for the new IO
implementation on themes. :)

Rainer and I currently agonze over the state model for widgets because
we believe that we can improve things there to fully incorporate the
concept of a focus that is assigned to widgets either by mouse events
or keyboard events. Although the modifications will not affect the
fundamental basis of FengGUI, it may have an impact on the state
classes (naming basically) of most widgets.

We keep you guys updated of course!

Cheers,

Johannes