Introduce a Visitor for Graph, Rule and Node which print Makefile rules

Summary: implement a Makefile Translator

Test Plan: convert CMake to json, json to Makefile and build with make

Reviewers: adrien, adrienconrath

Reviewed By: adrienconrath

Subscribers: adrienconrath, NicolasDP

Differential Revision: http://91.121.199.76/D9