This commit is the 3/3 part of the fix for the following security
vulnerability:
- CVE-2021-42076 DoS via excess length messages
The issue has been reported by Matthias Gerstner <mgerstner@suse.de>.
(cherry picked from commit fd5295eb31)
- reordered includes to prevent accidental dependencies.
- moved arch specific files into their own folder (easier to include with cmake).
- renamed non-class files to reflect new code style (lower case with underscores).
- using full relative paths for includes (easier for understanding dependencies).
- using #pragma once instead of classic-style header guards.