* 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
* Move RigWellResultFrame implementation into separate file
Update/correct includes accordingly
* First step of moving attributes from public to private
- Move public members to private and create interface
- Single public member remains due to strong dependency on usage of reference and reference to its object public members
* Second step of moving attributes from public to privatee
- Remove usage of reference directly to attributes. Interface with copy and set.
- Moving attributes in RigWellResultFrame and RigWellResultBranch
* Move class RigWellResultBranch into separate file
