RFC: automated code formatting results.

[robertlipe]

• Add prototype clang format, reformat-tree
• Add the correct clang-formats
• First pass just to see what the diffs look like.

Description

Contributing requirements

• [x] I read the contribution guidelines in CONTRIBUTING.md.
• [x] I understand the BlinkenPerBit metric, and maximized it in this PR.
• [x] I selected main as the target branch.
• [x] All code herein is subjected to the license terms in COPYING.txt.