Support control character escapes, add :AllChars attribute

Also:
- fix warning in RevBank::Plugin->Tab when there are attrs but no :Tab
- reconstruct quotes and escapes in prompt on retry

lib/RevBank/Plugin.pm

@@ -22,7 +22,7 @@ sub Tab($self, $method) {
         ref $method ? $method : $self->can($method)
     ) or return;
 
-    my ($tab) = $attr =~ /Tab \( (.*?) \)/x;
+    my ($tab) = $attr =~ /Tab \( (.*?) \)/x or return;
     for my $keyword (split /\s*,\s*/, $tab) {
         if ($keyword =~ /^&(.*)/) {
             my $method = $1;
@@ -44,6 +44,14 @@ sub Tab($self, $method) {
     return keys %completions;
 }
 
+sub AllChars($self, $method) {
+    my $attr = attributes::get(
+        ref $method ? $method : $self->can($method)
+    ) or return;
+
+    return !!($attr =~ /AllChars/);
+}
+
 1;
 
 __END__