warn: Reorganize messages object, should make it more clear to maintain

Setting it up this way means there is even more of a difference between the scaled levels (level2, level4im, etc.) and singlenotice/singlewarning/custom,
but doing so should make it very straightforward to remove or add templates (pursuant to any discussion in #533).

The only change to the enduser is that this will now generate a submenu category for every grouping, even if there are no templates in that group at that level.  At the moment, this is only the `4im` level for the "Removal of deletion tags" category.  I'm not sure this is a bad thing.

One header was mistmatched ('other editors' versus 'other users'), resolves that.

modules/procjson.pl

@@ -0,0 +1,61 @@
+#!/usr/bin/env perl
+# procjson.pl by Amory Meltzer
+
+use strict;
+use warnings;
+use diagnostics;
+
+my (%store,%catL);
+my @cats;
+my @levels = qw(1 2 3 4 4im);
+my ($uw, $lvl, $lt) = (q{},q{},0);
+my $cat = q{};
+
+open my $in, '<', "$ARGV[0]" or die $1;
+while (my $l = <$in>) {
+  chomp $l;
+  if ($l =~ /^\t\t\t"(uw-.+)(\d(?:im)?)": \{/) { # Level template
+    ($uw,$lvl,$lt) = ($1,$2,$.);
+    push @{$catL{$cat}}, $uw;
+  } elsif ($l =~ /^\t\t"(.+)": \{/) { # Category
+    $cat = $1;
+    push @cats, $cat;
+  } elsif ($. == $lt+1) { # label
+    $store{$cat}{$uw}{$lvl}{label} = $l;
+  } elsif ($. == $lt+2) { # summary
+    $store{$cat}{$uw}{$lvl}{summary} = $l;
+  }
+}
+close $in or die $1;
+
+# use Data::Dumper;
+# print Dumper(%store);
+
+# Uniqify
+my %seen;
+@cats = grep !$seen{$_}++, @cats;
+
+# process outfile
+open my $out, '>', 'out.json' or die $1;
+print $out "\tlevels: {\n";
+foreach my $group (@cats) {
+  print $out "\t\t\"$group\": {\n";
+  # Uniqify
+  my %seen2;
+  @{$catL{$group}} = grep !$seen{$_}++, @{$catL{$group}};
+  foreach my $temp (@{$catL{$group}}) {
+    print $out "\t\t\t\"$temp\": {\n";
+    foreach my $level (@levels) {
+      if ($store{$group}{$temp}{$level}) {
+	print $out "\t\t\t\tlevel$level: {\n";
+	print $out "\t$store{$group}{$temp}{$level}{label}\n";
+	print $out "\t$store{$group}{$temp}{$level}{summary}\n";
+	print $out "\t\t\t\t},\n";
+      }
+    }
+    print $out "\t\t\t},\n";
+  }
+  print $out "\t\t},";
+}
+print $out '},\n';
+close $out or die $1;