Command line tools have inconsistent arguments

qmlprofiler does not accept double dash long arguments such as '--help', but does accept (and documents) single dash long arguments.

qmltestrunner documents single dash long arguments.

qmlscene mostly documents double dash arguments, but also documents a single dash -translations argument.

qmake uses single dash long arguments.

Most Qt tools use double dash long arguments (but accept single dash arguments for compatibility).