30 is most likely a more reasonable default lambda for the new iterative shape-fitting - need to get some more experience with it

pybind11 deprecated .check().

This is to be consistent on the order of the elements with C++ and Matlab.

Specifically, added python bindings for:
* LandmarkMapper (core submodule)
* EdgeTopology, load_edge_topology()
* ContourLandmarks, ModelContour
* fit_shape_and_pose()
* Mesh (render submodule)

I don't think any of them use the nonlin ortho camera estimate anymore

Just test it locally after we're done.

Also move adding -pthreads to examples/CMakeLists.txt, this will eventually have to be modernised as well