Make link to local functions clickable

call instructions now have a clickable target address that gets you to
the corresponding function iff this function is local to the object.

It still does just nothing on functions that are linked in from shared
objects or functionsthat were not created (shouldn't happen right now)

This also adds yet another map to the MainWindow with key/value pairs
that are not quite semantically nice but made implementation easy. We
need to think about how which objects are referenced from ithin the
mainwindow some tim in the future.