GeoMagSharp 1.7.1

What's Changed

• chore: bump version to 1.6.0 by @StreckerCM in #10
• feat: Add dipole depth correction (SPE-128217-MS) - Issue #3 by @StreckerCM in #11
• test: Add IGRF cross-validation tests (Issue #12) by @StreckerCM in #14
• Add HDGM support via NOAA DLL P/Invoke (#19) by @StreckerCM in #20
• Add ModelDiscovery API for folder-based model enumeration (#21) by @StreckerCM in #22
• docs: README accuracy fixes (IDisposable + bundled coefficients) by @StreckerCM in #23
• fix: multi-epoch IGRF/DGRF + cache invalidation + NONE-filter (#24 #26 #27) by @StreckerCM in #25
• Promote development to preview: v1.7.1 (#24 #26 #27) by @StreckerCM in #28
• Release v1.7.1: ModelDiscovery API + IGRF/DGRF DisplayName fix by @StreckerCM in #29

Full Changelog: v1.5.0...v1.7.1