Continuous integration build 2259, based on Superbuild 20201219.
Major Changes:
- :earth_africa: KMZ (ground overlay) support for export, import and templates (GH-138, GH-1793)
- Re-added missing "datumgrid" files for precise georeferencing (GH-1802)
- Minor OCD format improvements, including a fix for a crash (GH-1796)
- Template data saving improvements:
- Atomic scribble template saving (GH-1785)
- Error reporting for template saving (GH-1790)
- Template saving working for all file formats (GH-1791)
- List all geospatial vector data export formats explicitly (GH-1779)
- Consistent GPX track positioning (regression, GH-1709)