Add icon support for entities card title

lib/cards/card.class.dart

@@ -7,6 +7,7 @@ class HACard {
   String name;
   String id;
   String type;
+  String icon;
   bool showName;
   bool showState;
   bool showEmpty;
@@ -40,6 +41,7 @@ class HACard {
     this.max,
     this.depth: 1,
     this.severity,
+    this.icon,
     @required this.type
   }) {
     if (this.columnsCount <= 0) {

lib/cards/entities_card.dart

@@ -21,23 +21,28 @@ class EntitiesCard extends StatelessWidget {
           return en.entity.entityId;
       }).toList();
       headerSwitch = Switch(
-            value: headerToggleVal,
-            onChanged: (val) {
-              if (entitiesToToggle.isNotEmpty) {
-                ConnectionManager().callService(
-                  domain: "homeassistant",
-                  service: val ? "turn_on" : "turn_off",
-                  entityId: entitiesToToggle
-                );
-              }
-            },
-          );
+        value: headerToggleVal,
+        onChanged: (val) {
+          if (entitiesToToggle.isNotEmpty) {
+            ConnectionManager().callService(
+              domain: "homeassistant",
+              service: val ? "turn_on" : "turn_off",
+              entityId: entitiesToToggle
+            );
+          }
+        },
+      );
     }
     body.add(
       CardHeader(
         name: card.name,
         trailing: headerSwitch,
-        emptyPadding: Sizes.rowPadding
+        emptyPadding: Sizes.rowPadding,
+        leading: card.icon != null ? Icon(
+          MaterialDesignIcons.getIconDataFromIconName(card.icon),
+          size: Sizes.iconSize,
+          color: Theme.of(context).textTheme.headline.color
+        ) : null,
       )
     );
     body.addAll(

lib/cards/widgets/card_header.widget.dart

@@ -4,10 +4,11 @@ class CardHeader extends StatelessWidget {
 
   final String name;
   final Widget trailing;
+  final Widget leading;
   final Widget subtitle;
   final double emptyPadding;
 
-  const CardHeader({Key key, this.name, this.emptyPadding: 0, this.trailing, this.subtitle}) : super(key: key);
+  const CardHeader({Key key, this.name, this.leading, this.emptyPadding: 0, this.trailing, this.subtitle}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -15,6 +16,7 @@ class CardHeader extends StatelessWidget {
     if ((name != null) && (name.trim().length > 0)) {
       result = new ListTile(
         trailing: trailing,
+        leading: leading,
         subtitle: subtitle,
         title: Text("$name",
             textAlign: TextAlign.left,

lib/view.class.dart

@@ -46,6 +46,7 @@ class HAView {
             id: "card",
             name: rawCardInfo["title"] ?? rawCardInfo["name"],
             type: rawCardInfo['type'] ?? CardType.ENTITIES,
+            icon: rawCardInfo['icon'],
             columnsCount: rawCardInfo['columns'] ?? 4,
             showName: (rawCardInfo['show_name'] ?? rawCard['show_name']) ?? true,
             showHeaderToggle: (rawCardInfo['show_header_toggle'] ?? rawCard['show_header_toggle']) ?? false,