Port aclahe module to C++

[cappelletto]

Port (via new branch) current Python based ACLAHE implementation, while retaining the same functionality, except perhaps, argument parsing.
@ricardobiundo you are invited to join this one

[cappelletto]

New branch created with template C++ source and CMake. Please check guidelines and other module implementation for uniformity purposes, those without an operating OpenCV installation please contact @vgarciac or @fmoralesh for most recent setup instructions