Several adjustments related to Qt6

* Avoid ambiguous definition during unity build on Windows
* Add missing include
* Add Qt6 to expressionparser
* Add Qt6 to nightcharts
* Replace forward define of QStringList with include <QStringList>
* Use toMSecsSinceEpoch
* Use setContentsMargins

ApplicationLibCode/Application/Tools/RiaImportEclipseCaseTools.h

@@ -18,13 +18,14 @@
 
 #pragma once
 
+#include <QStringList>
+
 #include <map>
 #include <memory>
 #include <utility>
 #include <vector>
 
 class QString;
-class QStringList;
 
 class RimIdenticalGridCaseGroup;
 class RimRoffCase;