- Rename RifColorLegendData to RifFormationNamesReader to better reflect the
class purpose of reading formation names from .lyr files.
- Remove inheritance of cvf::Object
- Improve const correctness
* 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
* Refactor interface to PdmObjectHandle and PdmFieldHandle
Return objects instead of passing in structures as parameters
* Add nodiscard to several functions
* Remove redundant this->
* Rename to ptrReferencedObjectsByType