Inconsistent neighbors, rhombus types, and sides

[gordonwoodhull]

Sides should be consistently numbered from 0 - 3, and these should correspond to the calculated tile neighbors as well as the given geometric points for rhombuses.

This should be the case across all 20 base rhombuses.

Currently, the order of sides needs to be reversed, and offset differently depending on the base rhombus. There are many ugly workarounds in gordonwoodhull/hexapipes.