tesselator: start integration of libtess2 with a basic Tesselator class
tesselator: add all the .c to the tesselator extension. basic mesh works, still wip.
Separate meshes and vertices, 2 differents mode of result iterations. Added documentation, cleaned example.
tesselator: added pictures for the documentation
tesselator: change the example to be compatible with python 3
tesselator: fix documentation typo
tesselator: fixed version
Merge pull request #2440 from kivy/tesselator

Tesselator