V-REP python integration

[ahundt]

consider implementing V-REP python integration for plugin + analysis.

Strategy 1: cython

Make a python plugin with this and cython:
https://github.com/CoppeliaRobotics/v_repPlusPlus
https://cython.readthedocs.io/en/latest/src/userguide/wrapping_CPlusPlus.html

The general procedure for wrapping a C++ file can now be described as follows:

    Specify C++ language in setup.py script or locally in a source file.
    Create one or more .pxd files with cdef extern from blocks and (if existing) the C++ namespace name. In these blocks,
        declare classes as cdef cppclass blocks
        declare public names (variables, methods and constructors)
    Write an extension modules, cimport from the .pxd file and use the declarations.

• https://stackoverflow.com/questions/22589868/call-python-code-from-c-via-cython
• call cython from c++
• cython class pointer we will need a list of these for various python plugins.

Nice example of python interface to cython c++:
https://github.com/jrl-umi3218/Eigen3ToPython

Strategy 2 cffi

https://bitbucket.org/cffi/cffi
http://cffi.readthedocs.io/en/latest/index.html

• embedding.py extern python cffi
• embedding_test.c