--verbose enables logging of messages and LOG_INFO and --unfiltered_log disables repeated log line filters. Both are useful for extreme support sessions where things have gone so far south that you actually would need this.
All of the monitor discovery logic can be implemented with Qt. This
change removes all the x11 implementations in favor of Qt and removes a
fair amount of platform specific code.
Instead of checking to see if the window's position is valid, check to
see if the rectangles of the window and the monitor intersect via a
rectangle intersection test.
