Maintenance fixes

* Remove light mode from theme selection
The light mode is not working well, and was intended to be used when exporting to pdf from dark mode.

* Allow direct edit of summary case name
The name for a summary case can be automatically created. If the user starts to edit the name manually, set the name option to Custom. Make the descriptionField available as not read-only, then it is possible to edit the name directly in the project tree using F2 or double-click.

* Allow drag of ensembles
* Add support for drag/drop of well segments
* Add support for well segment number stepping in toolbar

ApplicationLibCode/ProjectDataModel/RimObservedDataCollection.cpp

@@ -168,7 +168,6 @@ RimObservedSummaryData* RimObservedDataCollection::createAndAddRsmObservedSummar
     observedData->setSummaryHeaderFileName( fileName );
     observedData->createSummaryReaderInterface();
     observedData->updateMetaData();
-    observedData->updateOptionSensitivity();
 
     if ( errorText && !observedData->errorMessagesFromReader().isEmpty() )
     {
@@ -224,7 +223,6 @@ RimObservedSummaryData* RimObservedDataCollection::createAndAddCvsObservedSummar
     userData->setSummaryHeaderFileName( fileName );
     userData->createSummaryReaderInterface();
     userData->updateMetaData();
-    userData->updateOptionSensitivity();
 
     if ( errorText && !userData->errorMessagesFromReader().isEmpty() )
     {