Document all simple and single geometric special cases

[thomcom]

Closed by #1064

This task is for documenting and planning special cases that need to be tested among binary predicates, such as tests with polygons with holes and linestring and polygon crossings.

There are many special cases of polygons that will need to have tests written for them. I'm writing a suite of special case tests to handle all possible configurations of geometric relations between two features.

See https://github.com/thomcom/spatial-predicates

#1064 implements 33 unique test cases for the three basic types: point, linestring, and polygon. The tests are run with each of the binary predicates and are used for developing each feature.

A future issue and PR will track the creation and validation of multi-geometry feature predicates.
Another future issue will track the execution of any special cases that don't fall into the original 33, if any are discovered.

Originally posted by @thomcom in #1016 (comment)