parser: convert remaining pwarn() to flag controlled warns

Make all warnings that go through pwarn() controllable by warning
flags. This adds several new warning control flags, documented in

  --help=warn

Convert --debug-cache to be unified with warning flags. So it can be
set by either
    --debug-cache
  or
    --warn=debug-cache

Also add an "all" option to be able to turn on all warnings.

MR: https://gitlab.com/apparmor/apparmor/-/merge_requests/600
Signed-off-by: John Johansen <john.johansen@canonical.com>

parser/parser_regex.c

@@ -382,7 +382,7 @@ pattern_t convert_aaregex_to_pcre(const char *aare, int anchor, int glob,
 					/* quoting mark used for something that
 					 * does not need to be quoted; give a
 					 * warning */
-					pwarn("Character %c was quoted "
+					pwarn(WARN_FORMAT, "Character %c was quoted"
 					      "unnecessarily, dropped preceding"
 					      " quote ('\\') character\n",
 					      *sptr);