Resolves #204 Alarm panel card support

lib/ui_widgets/card_header_widget.dart

@@ -3,14 +3,18 @@ part of '../main.dart';
 class CardHeaderWidget extends StatelessWidget {
 
   final String name;
+  final Widget trailing;
+  final Widget subtitle;
 
-  const CardHeaderWidget({Key key, this.name}) : super(key: key);
+  const CardHeaderWidget({Key key, this.name, this.trailing, this.subtitle}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     var result;
     if ((name != null) && (name.trim().length > 0)) {
       result = new ListTile(
+        trailing: trailing,
+        subtitle: subtitle,
         title: Text("$name",
             textAlign: TextAlign.left,
             overflow: TextOverflow.ellipsis,