badwords: rework exceptions, fix many of them

Also:
- support per-directory and per-upper-directory whitelist entries.
- convert badlist input grep tweak into the above format.
  (except for 'And' which had just a few hits.)
- fix many code exceptions, but do not enforce.
  (there also remain about 350 'will' uses in lib)
- fix badwords in example code, drop exceptions.
- badwords-all: convert to Perl.
  To make it usable from CMake.
- FAQ: reword to not use 'will'. Drop exception.

Closes #20886

lib/doh.c

@@ -1049,7 +1049,7 @@ UNITTEST void de_cleanup(struct dohentry *d)
  * https://datatracker.ietf.org/doc/html/rfc1035#section-3.1
  *
  * The input buffer pointer will be modified so it points to after the end of
- * the DNS name encoding on output. (And that is why it is an "unsigned char
+ * the DNS name encoding on output. (that is why it is an "unsigned char
  * **" :-)
  */
 static CURLcode doh_decode_rdata_name(const unsigned char **buf,