WIP: Cards build optimization

lib/cards/vertical_stack_card.dart

@@ -0,0 +1,23 @@
+part of '../main.dart';
+
+class VerticalStackCard extends StatelessWidget {
+  final HACard card;
+
+  const VerticalStackCard({Key key, this.card}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if (card.childCards.isNotEmpty) {
+      return Column(
+        mainAxisSize: MainAxisSize.min,
+        mainAxisAlignment: MainAxisAlignment.start,
+        children: card.childCards.map(
+          (childCard) => LovelaceCard(card: childCard)
+        ).toList(),
+      );
+    }
+    return Container(height: 0.0, width: 0.0,);
+  }
+
+  
+}