- Remove the need for upfront_decoder.bind( source = ... ): compute the relevant argument from the requested location in _get_unpacked and pass it explicitly
- Remove ability to pack using deprecated, old-style 32-bit references which are known to overflow and lead to data corruption - only keep the ability to pack 64-bit references. Throw an exception if such an packing version still requested (note: the unpacking is left as-is)
- Improve implementation of packing and unpacking of references
- Unify setters in event model classes for SmartRef and pointer: remove redundant overloads (which could be ambiguous, and require additional casts!)

patch generated by https://gitlab.cern.ch/lhcb/LHCb/-/jobs/35429884

perform some renaming of locations and revert back changes to get closer to master and be better backward compatible

removed old PrimaryVertex class and replaced by simple new one

- use this as a base class of ExtendedPrimaryVertex, the class stored by
  PrimaryVertexContainer
- introduce old--style packers/unpackers for PrimaryVertex
- added constexpr to propertyName of old-style packers
- added packing_mapping for soatype packers

- streamlined PV unbiasing code
- updated Particle packing checker

add properties needed for packing  to PrimaryVertices
added PrimaryVertices to selective packer/unpacker

and make `unpack` return a StatusCode to know when an unpacker has
failed, in which case, if available, another unpacker for the same
CLID can be tried