Support filtering by formation/polygon when calculating statistics (#12086)

* Support loading formation names when importing an ensemble
* Enable support for formation filtering when calculating contour map
* Add option to limit calculation area to a selection of polygons

ApplicationLibCode/ProjectDataModel/Formations/RimFormationNamesCollection.h

@@ -0,0 +1,45 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) Statoil 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 "cafPdmChildArrayField.h"
+#include "cafPdmObject.h"
+
+class RimFormationNames;
+
+//==================================================================================================
+///
+//==================================================================================================
+class RimFormationNamesCollection : public caf::PdmObject
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimFormationNamesCollection();
+
+    const caf::PdmChildArrayField<RimFormationNames*>& formationNamesList() const { return m_formationNamesList; }
+
+    void readAllFormationNames();
+
+    std::vector<RimFormationNames*> importFiles( const QStringList& fileNames );
+
+    void onChildDeleted( caf::PdmChildArrayFieldHandle* childArray, std::vector<caf::PdmObjectHandle*>& referringObjects ) override;
+
+private:
+    caf::PdmChildArrayField<RimFormationNames*> m_formationNamesList;
+};