This allows clipboard to operate (cut, copy, paste and delete) in the
win32 front end. The clipboard is set and read in windows unicode
mode and then converted to/from utf-8 for the browser core.
The use of the application instance handle global variable was
inconsistent throughout the windows frontend.
By rationalising the passing of these handles it showed that some of
the toolbar and throbber parent handles were also setup wrong giving
odd offset behaviour.
All these issues have been addressed and the throbber is now in the
correct position.
