Also updated documentation

We copied this from the pybind11/eigen.h header. If we need it, we can always re-add it.

Let's see if there's ever a "modern CMake" solution for this without a custom target.
target_sources(eos INTERFACE ${HEADERS}) doesn't seem to be a proper solution.

Also swapped order of project() declaration and cmake_minimum_required()

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)