#14737 Add reordering support to case collections

Add caf::PdmFieldReorderCapability to the child array fields holding
RimCase objects:
- RimEclipseCaseCollection::cases (grid models in Project Tree)
- RimCaseCollection::reservoirs (statistics case groups)
- RimGeoMechModels::m_cases (geomechanical models)

This enables the built-in move up/down tree item controls for
reordering cases, matching the pattern already used for e.g.
RimSurfaceCollection and RimMultiPlot.

ApplicationLibCode/ProjectDataModel/GeoMech/RimGeoMechModels.cpp

@@ -29,6 +29,8 @@
 #include "RimIntersectionResultDefinition.h"
 #include "RimIntersectionResultsDefinitionCollection.h"
 
+#include "cafPdmFieldReorderCapability.h"
+
 CAF_PDM_SOURCE_INIT( RimGeoMechModels, "ResInsightGeoMechModels" );
 //--------------------------------------------------------------------------------------------------
 ///
@@ -38,6 +40,7 @@ RimGeoMechModels::RimGeoMechModels()
     CAF_PDM_InitObject( "Geomechanical Models", ":/GeoMechCases48x48.png" );
 
     CAF_PDM_InitFieldNoDefault( &m_cases, "Cases", "" );
+    caf::PdmFieldReorderCapability::addToField( &m_cases );
 }
 
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/RimCaseCollection.cpp

@@ -24,6 +24,8 @@
 #include "RimIdenticalGridCaseGroup.h"
 #include "RimReservoirGridEnsemble.h"
 
+#include "cafPdmFieldReorderCapability.h"
+
 CAF_PDM_SOURCE_INIT( RimCaseCollection, "RimCaseCollection" );
 
 //--------------------------------------------------------------------------------------------------
@@ -34,6 +36,7 @@ RimCaseCollection::RimCaseCollection()
     CAF_PDM_InitObject( "Derived Statistics" );
 
     CAF_PDM_InitFieldNoDefault( &reservoirs, "Reservoirs", "Reservoirs ChildArrayField" );
+    caf::PdmFieldReorderCapability::addToField( &reservoirs );
 }
 
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/RimEclipseCaseCollection.cpp

@@ -35,6 +35,7 @@
 #include "RimReservoirGridEnsemble.h"
 
 #include "cafCmdFeatureMenuBuilder.h"
+#include "cafPdmFieldReorderCapability.h"
 
 CAF_PDM_SOURCE_INIT( RimEclipseCaseCollection, "ResInsightAnalysisModels" );
 //--------------------------------------------------------------------------------------------------
@@ -45,6 +46,7 @@ RimEclipseCaseCollection::RimEclipseCaseCollection()
     CAF_PDM_InitObject( "Grid Models", ":/Cases16x16.png" );
 
     CAF_PDM_InitFieldNoDefault( &cases, "Reservoirs", "" );
+    caf::PdmFieldReorderCapability::addToField( &cases );
 
     CAF_PDM_InitFieldNoDefault( &caseGroups, "CaseGroups", "" );