Moves jwm/transformer.h & corresponding files to transformer/jwm.h

This file move matches the namespace heirarchy
Renames jwm.cpp to jwm.cc & jwm_test.cpp to jwm_test.cc (Google style guide)
Renames amm::representation::menu_entry to amm::representation::Program as this entry is for programs in menu
Renames all types and functions in jwm/transformer.h to camel-case (Google style guide)