waywiser 0.4.0

Breaking Changes

• ww_build_neighbors() (and by extent, every spatial dependence metric) will
  no longer calculate neighbors for non-point or non-polygon geometries.

• Functions dealing with local Moran's I and related p-values (both data frame
  and vector variants) now return unnamed vectors.

New Features

• Added a new method to support passing a SpatRaster to data in
  ww_multi_scale(), with truth and estimate being indices used to subset
  data. This is a bit faster than passing SpatRaster objects to truth and
  estimate, as extraction is only done once per grid rather than twice, but
  does not easily support passing R functions to aggregation_function.

• Metric functions now have better error messages including the name of the
  function the user called that errored, not the internal function that
  errored. Huge thanks to @EmilHvitfeldt for their PR (#40).

• Data frame metric functions now guarantee that .estimate will be an unnamed
  vector.

Bug Fixes

• The sf method for ww_multi_scale() is now much faster (and more memory
  efficient).

• Fixed the warning when ww_area_of_applicability() calculates an AOA
  threshold of 0. It now includes "Did you accidentally pass the same data as
  testing and training?" as a bullet.