Don't use Qt module names in include directives. (#727)

Don't use Qt module names in include directives. (#727)

This simplifies migration to Qt6 where some classes moved.

This was done mostly by an ed script, although mkstyle.sh took some
hand holding.

1,$g/#include <QtCore\// s/<QtCore\/\([^>]*\)>/<\1>       /
1,$g/#include <QtGui\// s/<QtGui\/\([^>]*\)>/<\1>      /
1,$g/#include <QtNetwork\// s/<QtNetwork\/\([^>]*\)>/<\1>          /
1,$g/#include <QtWidgets\// s/<QtWidgets\/\([^>]*\)>/<\1>          /
1,$g/ *$/ s/ *$//
w
q