Add support for Qt6 and disable Qt5

Required changes to use Qt6 and disable support for Qt5. There are still some adjustments related to Qt6 to be done, but these changes are not required to make Qt6 compile on relevant systems.

* Build system changes Qt6
* Override enterEvent
* Update QKeySequence
* QtChart changes
* Use QScreen to instepct dotsPerInch
* Add app->quit()
* Required updates for code related to QString
* Use RiaQDateTimeTools
* Required changes related to regular expressions
* Support compile on Qt  < 6.5
When version < 6.5 is found, qt_generate_deploy_app_script() is disabled. Compilation of ResInsight will work, but the install target will be incomplete.
* Octave: add missing header.
* Qt Advanced Docking: force Qt6 where both Qt5 and Qt6 is available.

---------

Co-authored-by: magnesj <1793152+magnesj@users.noreply.github.com>
Co-authored-by: Kristian Bendiksen <kristian.bendiksen@gmail.com>

ApplicationLibCode/FileInterface/RifWellPathImporter.cpp

@@ -20,6 +20,8 @@
 
 #include "RifWellPathImporter.h"
 
+#include "RiaQDateTimeTools.h"
+
 #include "RifJsonEncodeDecode.h"
 
 #include "cafUtils.h"
@@ -140,7 +142,7 @@ RifWellPathImporter::WellMetaData RifWellPathImporter::readJsonWellMetaData( con
     QString updateDateStr  = jsonMap["updateDate"].toString().trimmed();
     uint    updateDateUint = updateDateStr.toULongLong() / 1000; // Should be within 32 bit, maximum number is 4294967295
                                                               // which corresponds to year 2106
-    metadata.m_updateDate.setTime_t( updateDateUint );
+    metadata.m_updateDate = RiaQDateTimeTools::fromTime_t( updateDateUint );
 
     return metadata;
 }