Voronoi tesselations from points

[justinmillar]

Probably will be multiple functions depending on the feature set we aim to cover. I do think that we will want sf-focused output (at least as an option) since sp is in the process of depreciation.

Some features to consider:

• Input type (data.frame, sf/sp object)
• Bounding shapefile (options to restrict within polygons/fields from reference shapefile)

[justinmillar]

Useful code for this might be found in https://github.com/PATH-Global-Health/PATHtoolsZambia/blob/main/excl/voronoi-shapefiles.R