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_urlglob.c

@@ -122,7 +122,7 @@ static CURLcode glob_set(struct URLGlob *glob, const char **patternp,
         goto error;
       }
 
-      /* add 1 to size since it will be incremented below */
+      /* add 1 to size since it is to be incremented below */
       if(multiply(amount, size + 1)) {
         result = globerror(glob, "range overflow", 0, CURLE_URL_MALFORMAT);
         goto error;