Statistics Contourmap UI updates (#12060)

* Enable time step selections and controls in view
* Support loading just what we need for statistics contour maps by using custom reader settings
* Close case once done with it unless there are active views.
* Add selection of user interface case (for result selection, display of wells, faults...)
* Avoid int overflow for nested progresses by using double
* Improve auto naming
* Misc. UI improvements

ApplicationLibCode/ReservoirDataModel/RigContourMapTrianglesGenerator.cpp

@@ -299,6 +299,8 @@ std::pair<std::vector<RigContourMapTrianglesGenerator::ContourPolygons>, std::ve
 
             const std::vector<double>& aggregatedVertexResults = contourMapProjection.aggregatedVertexResults();
 
+            if ( aggregatedVertexResults.empty() ) return {};
+
             std::vector<caf::ContourLines::ListOfLineSegments> unorderedLineSegmentsPerLevel =
                 caf::ContourLines::create( aggregatedVertexResults,
                                            contourMapProjection.xVertexPositions(),