Established new PDM structure with RimProject owning RimOilFields owning RimAnalysisModels.
Moved wellPathCollection into new class RimOilFields.
Moved cases (previously called reservoirs) and caseGroups from RimProject into new class RimAnalysisGroups.
Added support for old project files, move cases and caseGroups from RimProject to RimAnalysisModels. (Do not handle WellPaths for old project files in a similar way, since almost no users have used this functionality yet.)
p4#: 21846