COMMONS12 — The quantities and units ontology is missing the concept of a measurement reference

This would assist in alignment with SysML v2, but more importantly allows alignment of some quantity value with a more general measurement reference rather than only a measurement unit, for representation of IU in pharma, for example.

Add measurement reference to the quantities and units ontology

The resolution to this issue involves:
1. Adding a new measurement reference class, which is a subclass of the union of measurement procedure, measurement unit, and reference material, though not equivalent because there may be other related concepts
2. Adding / replacing the superclass for measurement procedure, measurement unit, and reference material with measurement reference as appropriate,
3. Adding measurement reference as the parent for measurement scale, corresponding with SysML v2, and
4. Adding a new property, has measurement reference, and making has measurement unit a subproperty of has measurement reference

Note that the metadata required for this revision has been applied to the resolution for Commons12-5 and thus the resolution to this issue depends on the resolution to Commons12-5.