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

src/tool_help.c

@@ -328,7 +328,7 @@ void tool_version_info(void)
     /* we have ipfs and ipns support if libcurl has http support */
     for(builtin = built_in_protos; *builtin; ++builtin) {
       if(insert) {
-        /* update insertion so ipfs will be printed in alphabetical order */
+        /* update insertion so ipfs is printed in alphabetical order */
         if(strcmp(*builtin, "ipfs") < 0)
           insert = *builtin;
         else