libgeotiff 1.5.0
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* Require PROJ >= 6 dependency
* Remove all CSV files used by geo_normalize API, since libgeotiff now relies
on PROJ database for EPSG CRS definitions.
* geo_normalize.c: SetGTParmIds(): use ProjStraightVertPoleLongGeoKey for CT_PolarStereographic
* geo_normalize.c: report StdParallel1 for Mercator_2SP when a PCS code is used
* geo_normalize.c: fix support for Laborde Oblique Mercator
* listgeo: use PROJ database to display non-hardcoded values of a number of keys