Fix init call order

This is due to a bug in Boost.Python

Add SWIG support

Handle support of template specialization for exposing new types

Move EIGENPY_MAKE_TYPEDEFS to a dedicated file

remove warnings

Boost 1.73 added a boring warning about deprecated use of boost bind,
which is still used by boost python.

As of Boost 1.75, this is still not fixed:
https://github.com/boostorg/python/pull/296
https://github.com/boostorg/python/pull/315

Recent CMake versions added this warning:
CMake Deprecation Warning at CMakeLists.txt:6 (CMAKE_MINIMUM_REQUIRED):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

And we are not compatible with CMake < 3.1:
ref https://github.com/jrl-umi3218/jrl-cmakemodules/issues/338

Comply with new CI rules

Sync submodule CMake

Sync submodule CMake and prepare new release 2.5.0

Add support for exporting Eigen::Ref to Python