* fix boolean-contains and boolean-within isLineInPoly
* update esri-contains and esri-within diagrams
* check if line is contained in boundary after splitting on intersections
* fix line simply containes in polygon, and tidy up test examples
* split linestring segments on polygon before checking midpoints
* add explanatory comments and update docs
---------
Co-authored-by: samuelarbibe <samuel.arbibe@gmail.com>
Co-authored-by: James Beard <james@smallsaucepan.com>
