* examples : refactor common code into a library
* examples : refactor common SDL code into a library
* make : update Makefile to use common libs
* common : fix MSVC M_PI ..
* addon.node : link common lib
* addon: implement node addon call whisper through cpp
* addon: modify the license to MIT
* addon: remove iostream
* addon: rename dir
* addon: fix typo
* addon: configure cmake to build when cmake-js is used