Custom linter: Run standard clang-format before

[MonsterDruide1]

Most linter passes in the custom linter are really badly written pattern matchers to prohibit "wrong" usage, which often assume that the format is already adequately formatted - otherwise they might not detect "wrong" styling or give wrong messages.

Because of this, it might be a good idea to run a pass of standard clang-format and require that to succeed first, before moving on to the custom linting passes.