add python path to conig.yml + fixed mac specific mouse bug

docs/config.example.yml

include/overkill/Config.hpp

include/overkill/Init.hpp

include/overkill/Watcher.hpp

include/overkill/gl_caller.hpp

src/Config.cpp

src/Init.cpp

src/Input.cpp

src/Scene.cpp

src/Watcher.cpp

src/gl_caller.cpp

src/main.cpp