What's Changed

This patch is primarily for some bug fixes. Here are the changes:

Added code to detect and handle an unusual configuration of polygons around a gap that wasn't covered before
Added the ability for the user to control the precision of the grid to snap coordinates to
Added a check/fix for empty geometries
Added fix for line segment fragments that are created after shapely's make_valid function. The new function make_valid_polygons filters through the GeometryCollection objects and filters out any non-polygonal results. (Special thanks to @coreyryanhanson for finding and providing preliminary code to fix this error)

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