Release v0.6.0

[brendancol]

Summary

• Prepare CHANGELOG for the v0.6.0 release
• 14 changes since v0.5.3, highlighted by the new .xrs xarray accessor (Fixes #790: add .xrs xarray accessors #868) which provides a convenient interface for all spatial operations directly on DataArrays and Datasets

Key changes

• xarray accessor (.xrs) — the headline feature for the 0.6.x series (Fixes #790: add .xrs xarray accessors #868)
• Configurable boundary mode for kernel-based spatial ops (Fixes #845: add configurable boundary mode to kernel-based spatial ops #874)
• Iterative tile Dijkstra for cost_distance (Fixes #880: fix cost_distance OOM with iterative tile Dijkstra #888)
• Weighted A* pathfinding with friction surface (Fixes #560: weighted A* pathfinding with friction surface #862)
• Mahalanobis distance metric (Fixes #114: add Mahalanobis distance metric #871)
• min_observable_height() experimental function (Fixes #804: add min_observable_height() to experimental #886)
• Hillshade aligned with GDAL + dask+cupy backend (Fixes #748: align hillshade with GDAL and add dask+cupy backend #867)
• GPU spill-to-CPU fallback for cost_distance (Add GPU spill-to-CPU fallback for cost_distance #863)
• CuPy support for true_color (added cupy support to true_color function #866)
• Removal of local analysis module with migration guide (Fixes #864: remove local analysis module, add migration guide #865)
• Perlin/terrain dask backend fixes (Fix perlin/terrain dask backends: enable parallelism and out-of-core support #870)
• Unified project requirements around setup.cfg (Fixes #587: unify project requirements around setup.cfg #873)
• Test warning cleanup (Fix test warnings: suppress expected GPU/NaN warnings, fix real code issues #887)

Next steps after merge

1. Tag: git tag -a v0.6.0 -s -m "Version 0.6.0" && git push --tags
2. Verify PyPI sdist + wheel publish
3. Create GitHub release from tag
4. Confirm conda-forge bot picks up the release