Added Matlab bindings for the fitting function

For system where Matlab is not found automatically.

This mainly required conversions for glm quat and mat4x4.

This contains conversion for vector<glm::tvecX> for the vertices, colours, and texcoords, and vector<array<int, 3>> for the triangle indices.
We can now successfully return a Mesh to Matlab.

Calling it works great!
No result is returned yet from C++ to Matlab.

This works when the current working directory in matlab is eos/matlab!

Also moved the Eigen Matrix to Matlab conversion to a separate file

Fixed bug that the given num_shape_coefficients_to_fit was not forwarded to the shape-fitting function

It didn't really results in a performance improvement, but it may help.

This results in a significant speed-up!

It doesn't make a real performance difference (since all matrices are smartpointers) but it's better practice.

Updated all example apps.

# Resolved conflicts:
#	include/eos/fitting/RenderingParameters.hpp
#	include/eos/fitting/contour_correspondence.hpp

It uses pose, shape, blendshapes and contour fitting.