Options built-in, by default, to most Qt-based applications.
https://doc.qt.io/qt-5/qapplication.html#QApplication https://github.com/qt/qtbase/blob/dev/src/widgets/kernel/qapplication.cpp#L449
-qdevel (obsolete)
--qmljsdebugger <port>
--reverse (not acrually implemented in QApplication)
--style <style>
--stylesheet <file>
--widgetcount
https://doc.qt.io/qt-5/qguiapplication.html#supported-command-line-options
--platform name[:options]
--platformpluginpath
--platformtheme
--plugin
--qmljsdebugger
--qwindowgeometry
--qwindowicon
--qwindowtitle
--reverse
--session
--display
--geometry