Summary multiplot improvements (#8598)

* Create multi summary plot from summary plot(s)
* Rearrange multi summary plot properties
* Enable source stepping toolbar for multi summary plot
* Automatically activate new summary plot when creating from data sources -> data vector tree
* Enable global key controls for switching data in summary and multi summary plots
* Update tooltip texts for summary plot toolbar

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlotCollection.h

@@ -0,0 +1,49 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  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 "RimAbstractPlotCollection.h"
+
+#include "cafPdmChildArrayField.h"
+#include "cafPdmObject.h"
+
+class RimSummaryMultiPlot;
+
+//==================================================================================================
+///
+///
+//==================================================================================================
+class RimSummaryMultiPlotCollection : public caf::PdmObject, public RimPlotCollection
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimSummaryMultiPlotCollection();
+    ~RimSummaryMultiPlotCollection() override;
+
+    void   deleteAllPlots() override;
+    void   loadDataAndUpdateAllPlots() override;
+    size_t plotCount() const override;
+
+    std::vector<RimSummaryMultiPlot*> multiPlots() const;
+
+    void addMultiSummaryPlot( RimSummaryMultiPlot* plot );
+
+private:
+    caf::PdmChildArrayField<RimSummaryMultiPlot*> m_summaryMultiPlots;
+};