aims at checking most of https://www.openssl.org/policies/codingstyle.html
and various requirements not yet explicitly stated there - see also #10725
add util/check-format.pl and its self-tests in
util/check-format-test-{positives,negatives}.c
remove util/openssl-format-source
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/10363)
