Resolves #148 assumed_state support

lib/entity_class/stateful_widgets.dart

@@ -28,12 +28,33 @@ class _SwitchStateWidgetState extends State<SwitchStateWidget> {
   @override
   Widget build(BuildContext context) {
     final entityModel = EntityModel.of(context);
-    return Switch(
-      value: entityModel.entity.assumedState == 'on',
-      onChanged: ((switchState) {
-        _setNewState(switchState, entityModel.entity);
-      }),
-    );
+    final entity = entityModel.entity;
+    if ((entity.attributes["assumed_state"] == null) || (entity.attributes["assumed_state"] == false)) {
+      return Switch(
+        value: entity.assumedState == 'on',
+        onChanged: ((switchState) {
+          _setNewState(switchState, entity);
+        }),
+      );
+    } else {
+      return Row(
+        children: <Widget>[
+          IconButton(
+            onPressed: () => _setNewState(false, entity),
+            icon: Icon(MaterialDesignIcons.createIconDataFromIconName("mdi:flash-off")),
+            color: entity.assumedState == 'on' ? Colors.black : Colors.blue,
+            iconSize: Entity.iconSize,
+          ),
+          IconButton(
+              onPressed: () => _setNewState(true, entity),
+              icon: Icon(MaterialDesignIcons.createIconDataFromIconName("mdi:flash")),
+              color: entity.assumedState == 'on' ? Colors.blue : Colors.black,
+              iconSize: Entity.iconSize
+          )
+        ],
+      );
+    }
+
   }
 }