* move hotkey settings in own GUI component -> easier adjustments
* some fixes for dock widgets when tab widget is shown without names (unrelated but found + fixed in same step)
* preparation for a context menu to send text messages from ATC/aircraft view
* preparation for context menu for fast pos. updates
* reverse ICAO lookup at login screen
* display fast updates / parts in GUI
* moved max- aircraft into settings
* made serverselection own component
* the term "components" will only be used for GUI components (derived from QWidget/ QWidget derived classes) fron now on
* timer, and enabler classes renamed accordingly: CEnableForRuntime, CEnableForDockWidgetInfoArea, CUpdateTimer
* adjusted all dependent classes
* QFontDialog is not working, as it is affected by the style sheets itself
* Added font settings to the GUI settings tab
* Added font color dialog for fonts
* Several utility methods