Run autopep8 as well as clang-format when calling "make format",
the PATHS argument is passed to both utilities which will only operate on files they support.
For example: `make format PATHS=release/scripts` formats Python scripts, `make format PATHS=source/blender/blenlib` would format C/C++.
If users really want they can format C/C++ & Python files at the same time since both formatting utilities filter on file extension.
`make format PATHS="release/scripts/startup/nodeitems_builtins.py source/creator/creator.c"`