Port to Qt 6

• If you haven’t done yet, then as first you should download and install Qt 6.5 or higher.
• After downloading we’ll take a look at all the deprecations.
• QML Calendar (qt.labs -> Qt Quick Controls)
• JP Nurmi’s Statusbar must be adjusted for Qt 6 ?
• From Qt Graphical Effects to Qt Quick MultiEffects
• From QNetworkConfigurationManager (QNCM) to QNetworkInformation
• Qt 6.5 is using the new Material 3 Design. Probably some UI controls must be adjusted
• The hardest part: Switch from qmake to cmake
• …