point_in_objectp working

[ChristopherHogan]

This PR isn't to merge, but to request feedback for the path I'm taking. I can successfully write

some_point in some_sphere

in python and it will call point_in_objectp(some_point, some_object), returning the correct result, but something seems off about this approach. Does it make sense to build up a pure python Sphere just to tear it apart in the typemap? It seems like we should just wrap ctlgeom-types.h and then do something like

point_in_objectp(meep.vector3(0, 0, 0), meep.sphere(center=meep.vector3(0, 0, 0), radius=2))

Then we wouldn't even need a typemap because the python objects would be SWIG proxy objects with types that correspond to the C types. I think I'm still unclear on exactly which header files we want to create python wrappers for.

@stevengj @HomerReid @oskooi

[stevengj]

My concern is that SWIG wouldn't create nice Python proxy objects for the C types in ctlgeom-types.h, so we won't have a nice Python API unless we make our "proxy objects" manually as you are doing here.

[ChristopherHogan]

Okay. I'll continue with this approach. Thanks.