OSGeo / PROJ / 3964

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WKT2 parsing: several fixes related to map projection parameter units

- WKT2 grammar: accept PARAMETER[name,value,id] without unit
- Recognize "Ellipsoid scaling factor" as a parameter with a scaling unit,
  and defaults to Unity when not specified
- WKT2 parsing: implement the requirement of 18-010r7.html#80, that is
  when a map projection parameter has no explicit unit, use metre/degree/unity
  as the default unit (contrary to WKT1 parsing rules where they are deduced
  from the GeogCRS angular unit and coordinate system)

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