rdsmart 2.1.2

Bug fixes

Spatial disaggregation using method.sample = "by_area" works properly again. Replaced use of deprecated function terra::area() with terra::expanse(). This should mean that rdsmart should be compatible with spatial data in a longitude/latitude CRS (but it's not tested).

Repackaged demonstration data dalrymple_covariates and dalrymple_polygons as (wrapped) SpatRaster and SpatVector objects respectively. Use terra::unwrap() to unwrap before use. Updated example code accordingly.
Added vignette by Matthew Coghill to explain major underlying changes to package from v2.1.0.

Replaced raster package functions with equivalent terra package functions. This requires at least terra version 1.1-17 (CRAN).
Wrote C++ sorting and ordering algorithms
Commented out the .onAttach() message since terra takes care of previous issues
Updated NAMESPACE and DESCRIPTION to handle package updates. Bumped minimum R version to 3.5.0 to mirror terra minimum version. Removed C50 import since disaggregate will install and load external model packages.
Cleaned up man folder

Created NEWS.md.
Updated doi links in documentation for disaggregate(), dsmart() and summarise() to https.
Implemented shannon_entropy() to compute Shannon's entropy (rather than compute it inside summarise()) and fixed a bug in its previous implementation.
Improved documentation for confusion_index().
The function summarise() now uses confusion_index() and shannon_entropy() to compute the confusion index and Shannon's entropy rather than computing them itself.
Implemented .onAttach() to display a message when the package is loaded to explain that writing rasters may fail under GDAL >= 3 and PROJ >= 6.