The legacy command combined import and assignment with an applyToCaseId.
This is split into RimProject_importFormationNames (returns the
FormationNames object) and RimCase_setFormationNames (takes the
object). RimFormationNames is made scriptable so it can be returned and
passed. RicfImportFormationNames forwards to both.
Project.import_formation_names() in Python keeps its signature, now
returns the FormationNames object, and gains an apply_to_all_cases
flag (default True, matching the old behavior).
Case.import_formation_names() is kept and emits a DeprecationWarning.
* 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