Replace the QString* errorMessage out-parameter with std::expected<RigFormationNames, QString> in RifFormationNamesReader, and propagate the pattern to RimFormationNames::readFormationNamesFile() which now returns std::expected<void, QString>.
Fatal errors (file cannot be opened, FMU line-parse failure) return std::unexpected. Malformed .lyr lines are still skipped so the rest of the file loads, with warnings logged via RiaLogging instead of collected in the out-parameter. RimFormationNamesCollection::readAllFormationNames() now logs errors it previously discarded.
* CMake: Remove dead CODE_HEADER_FILES variable
* CMake: Remove dead COMMAND_CODE_HEADER_FILES and COMMAND_MOC_SOURCE_FILES
* CMake: Remove dead MOC_SOURCE_FILES and FORM_FILES_CPP references
* CMake: Remove dead HEADER_FILES reference
* CMake: Delete unused CustomPCH.cmake superseded by target_precompile_headers
- 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
* 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