Use geo_types more

[nms-scribe]

I originally chose not to work with geo_types due to lack of conversion with gdal. Gdal (in rust) provides mechanisms to convert into geo_types, but doesn't provide methods to convert the other way.

Then I ended up writing my own geometry classes that wrap gdal that look a lot more like geo_types, so I could have more type-safety.

And then I ended up importing geo and geo_types for their spherical mapping algorithms.

In any case, to simplify my code, I shgould just write a conversion going back to gdal, and then replace my geometry code with geo_types, where the conversion code actually converts instead of wraps. This will reduce potential error spots, since geo_types doesn't return a lot of errors from their functions.

This could also replace the coordinates module.