Now that our formatter is a Python package (wpiformat), the format.py shim for invoking it is no longer necessary. styleguide#29 should be merged before this patch.
include guard section now requires #pragma once, enumerators now exclusively use constant naming, and a mention of format.py was added to the "Formatting" section and CONTRIBUTING.md.
* Replaced include guards with #pragma once
* All source files now have exactly one newline appended
Some files had either two newlines at the end or none (which isn't POSIX compliant). This patch fixes that.
