Merge branch 'pkg_python_wrappers' into 'develop'

CMake/FindNumpy.cmake

CMake/UseSWIGLocal.cmake

CMake/otbTestNumpy.py

CMakeLists.txt

Modules/Wrappers/SWIG/src/CMakeLists.txt

Modules/Wrappers/SWIG/src/python/CMakeLists.txt

Modules/Wrappers/SWIG/src/python/StandaloneWrapper.in

Modules/Wrappers/SWIG/test/python/CMakeLists.txt

Packaging/Files/build_wrapping.cmake

Packaging/Files/build_wrapping.md

Packaging/install_python_bindings.cmake