Marching Order 3.1 (#924)

* Fixed an issue with zero-length transformed paths in PathMath. Added ad-hoc formations and old-school follow button to Marching Order.

* Updated documentation for Marching Order.

* Marching Order: When doing wall collisions, get walls from the token's page, not the current Campaign page.

Co-authored-by: Cazra <stephen.lindberg@rkcybersolutions.com>