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_main.c

@@ -78,7 +78,7 @@ int _CRT_glob = 0;
  * Ensure that file descriptors 0, 1 and 2 (stdin, stdout, stderr) are
  * open before starting to run. Otherwise, the first three network
  * sockets opened by curl could be used for input sources, downloaded data
- * or error logs as they will effectively be stdin, stdout and/or stderr.
+ * or error logs as they are effectively stdin, stdout and/or stderr.
  *
  * fcntl's F_GETFD instruction returns -1 if the file descriptor is closed,
  * otherwise it returns "the file descriptor flags (which typically can only
@@ -111,7 +111,7 @@ static void memory_tracking_init(void)
     curl_free(env);
     curl_dbg_memdebug(fname);
     /* this weird stuff here is to make curl_free() get called before
-       curl_dbg_memdebug() as otherwise memory tracking will log a curlx_free()
+       curl_dbg_memdebug() as otherwise memory tracking logs a curlx_free()
        without an alloc! */
   }
   /* if CURL_MEMLIMIT is set, this enables fail-on-alloc-number-N feature */