Implicit conversion to *Poly

[dave992]

Most wrapped classes take as input a Poly type, e.g. the MoveInstruction class. At the moment we have to explicitly convert the non-poly type to a poly type using a function from the wrapper. An example would be a StateWaypoint which first needs to be converted to a StateWaypointPoly before being passed to the MoveInstruction using StateWaypointPoly_wrap_StateWaypoint.

Is there a way I could update the binding generation to allow an implicit conversion? I think this would make the wrapper a lot more Pythonic 👍