Update WKT import to support WKT2 corrigendum

[rouault]

Update WKT import/export to 18-010r10_CRS_WKT_Corrigendum.pdf and 18-005r7_AS_Topic_2_Referencing_by_Coordinates-1.pdf additions:

• ANCHOREPOCH[] in geodetic and vertical reference frame
• AXISMINVALUE[], AXISMAXVALUE[], RANGEMEANING[] in AXIS[]

Update PROJJSON import/export accordingly

Fixes #3571

[rouault]

CC @thareUSGS maybe of interest for planetary use cases the addition of constructs like AXIS["longitude",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433],AXISMINVALUE[0],AXISMAXVALUE[360]]. This pull request doesn't do more than round-tripping them, but I can imagine this could be used at some point by the computation part of PROJ to add +/- 360 modulos when outputting longitudes.

[AndrewAnnex]

@rouault there may be a related issue with CRSs defined with west longitudes I am running into presently (e.g. IAU:49916) although I am still looking into it to post a sufficiently detailed issue. I'll post it next week anyways for further discussion