Changes:
- Add CoordinateEpochGeoKey = 5120 of type DOUBLE to store coordinate epoch of tie points / geotransform matrix for dynamic CRS.
See opengeospatial/geotiff#99 - geo_normalize.h/c: rename variables to please codespell
- GTIFGetGCSInfoEx(): use proj_crs_get_datum_forced() for PROJ >= 8 to avoid issues with datum ensembles (fixes #54)
- GTIFGetGCSInfoEx(): remove dead code (GDAL Coverity CID 1432690)
- geo_normalize.c: follow-up to e06625c to avoid look up of user-defined GeogGeodeticDatumGeoKey that cause PROJ warnings (fixes #41)