Drop unused modules declared in setup.py The YAML/Jinja2 dependencies were left behind after the project_generator code was spun out of the valinor project into a separate project.
Replace arm-none-eabi-gdb with gdb-multiarch Since the introduction of gdb-multiarch, arm-none-eabi-gdb is no longer available in Debian, so we replace it with the multiple-arch aware version of gdb from gdb-multiarch