Final functionality features...

Load icon from resource file
implement seticon()

While the features are all there, some are buggy.  Scaling is wrong
for example, and keyboard input may do weird things if shift or
control are held when you take focus away from the window, then
release them when the focus is elsewhere, then re-focus the window.
This should only impact extended keys (ie: ones that don't send a
character to the remote).