Rioxarray

------
- BUG: Remove grid_mapping from attrs when writing (pull 783)
- BUG: Ensure gcp_crs exists before writing in `rio.write_gcps` (issue 646)

------
- BUG: Raise OverflowError when nodata data type conversion is unsafe (pull 782)
- BUG: Support writing GCPs to netCDF (issue 778)
- BUG: Fix reading dask chunks when band_as_variable=True (issue 761)
- REF:merge: Use merge path & rio.to_raster (pull 781)

------
- BUG:reproject: Allow rotated rasters (issue 746)

------
- BUG:reproject_match: Remove setting spatial dims on output resampled dataset (issue 768)

------
- BUG:merge: Use `rasterio.io.MemoryFile`` for reading (pull 765)
- BUG:merge: Add simple defaults for unused payload/colormap (pull 766)

------
- BUG: Add decode_coords kwarg to backend entrypoint (pull 763)
- BUG: Avoid DeprecationWarning: xr.Dataset.drop() -> xr.Dataset.drop_vars() (pull 740)