* QDialog based navigator
* Removed no longer used info area and navigator dock widget
* fixed style sheet
* added some space which can be used to drag navigator when frameless
* callback when frameless is toggled
Status: https://dev.vatsim-germany.org/issues/503#note-10
* Added extra QFrame in CDockWidgets to have better control in stylesheez (CDockWidget -> QWidget -> QFrame)
* Adjusted stylesheets
* Force update of stylesheet when frameless changes
* Cascading status message in nested CInfoArea components
Floating frameless dock widget still not transparent
* different dyn. property names for main window, dock window and infoarea
* dyn.properties for nested QWidgets
* style sheet for navigator
* utility function to delete layout
* added standard OS icons, some formatting in CICons
* actions in main window to be used in navigator
* main window becomes normal window when minimized so it is correctly displayed in Win taskbar
Remark: Frameless floating dockwidgets with rounded borders not yet working