Show summary data as tree structure in explorer. (#8430)

* Show summary data vectors in project explorer for both summary cases and ensembles.
* Enable Drag to be able to drag'n'drop data vector into future summary plot
* Make sure tree is refreshed on reload/replace operations
* Provide case id and ensemble id in drag/drop object in addition to address

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryAddressCollection.h

@@ -0,0 +1,59 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2022     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "RimNamedObject.h"
+
+#include "cafPdmChildArrayField.h"
+
+#include <QString>
+#include <string>
+#include <vector>
+
+class RimSummaryAddress;
+class RifEclipseSummaryAddress;
+
+class RimSummaryAddressCollection : public RimNamedObject
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimSummaryAddressCollection();
+    ~RimSummaryAddressCollection() override;
+
+    void updateFolderStructure( const std::set<RifEclipseSummaryAddress>& addresses, int caseid, int ensembleId = -1 );
+
+    void clear();
+
+    bool isEmpty() const;
+
+    void updateUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering ) const;
+
+private:
+    RimSummaryAddressCollection* getOrCreateSubfolder( const QString folderName );
+
+    bool hasDataVector( const QString quantityName ) const;
+    bool hasDataVector( const std::string quantityName ) const;
+
+    void addAddress( const RifEclipseSummaryAddress& address, int caseId, int ensembleId = -1 );
+    void addToSubfolder( QString foldername, const RifEclipseSummaryAddress& address, int caseId, int ensembleId = -1 );
+
+private:
+    caf::PdmChildArrayField<RimSummaryAddress*>           m_adresses;
+    caf::PdmChildArrayField<RimSummaryAddressCollection*> m_subfolders;
+};