Improve ensemble curve colors

* Use unique_ptr
* Improve default assignment of curve appearance
* Improve display of color tags in tree view items
* Select curve or ensemble instead of plot
* Only change curves connected to a Rim-object

* Improve color management for ensemble curves
Use a base color for statistics curves and set realization curves transparent
Make sure new curves are assigned a unique color
Harmonize how dropped addresses are handled

* Update all tags always
The update of tags for a subset of tree nodes is currently broken. Always update all tags.

* Add const

ApplicationLibCode/ProjectDataModel/Summary/RimEnsembleCurveSetCollection.cpp

@@ -66,7 +66,7 @@ RimEnsembleCurveSetCollection::~RimEnsembleCurveSetCollection()
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-bool RimEnsembleCurveSetCollection::isCurveSetsVisible()
+bool RimEnsembleCurveSetCollection::isCurveSetsVisible() const
 {
     return m_showCurves();
 }