GDAL 3.1.0 is released

The 3.1.0 release is a new feature release with the following highlights:

Implement RFC 75: support for multidimensional arrays in MEM, VRT, netCDF, HDF4, HDF5 and GRIB drivers. Read/write for MEM and netCDF. Read/only for others. Add gdalmdiminfo and gdalmdimtranslate utilities.
Implement RFC 76: add capability of writing vector drivers in Python
New GDAL drivers:
- COG: write-only, for Cloud Optimized GeoTIFF
- EXR: read/write driver, relying on OpenEXR library
- ISG: read-only, for geoid models of the International Service for the Geoid
- RDB: read-only, for RIEGL Database .mpx RDB 2 files (#1538) (needs proprietary SDK)
New OGR drivers:
- FlatGeoBuf: read-support and creation (#1742)
- MapML: read/write driver for experimental web spec
Improved drivers:
- OAPIF driver (renamed from WFS3): updated to OGC API – Features 1.0 core spec
- GTiff: improve performance of internal overview creation
- GTiff: GeoTIFF 1.1 support
- Shapefile driver: add read/creation/update support for .shz and .shp.zip
- netCDF vector: read/write support for CF-1.8 Encoded Geometries (#1287)
- VICAR: multiple improvements and write support (#1855)
- DDS: add read support
Other improvements:
- gdalwarp: accept output drivers with only CreateCopy() capabilities
- gdal_viewshed:
- new utility for viewshed algorithm
Remove GFT driver now that the online service no longer exists (#2050)
New Sphinx-based documentation
Multiple security related fixes (ossfuzz)
Continued code linting (cppcheck, CoverityScan, etc.)