Refactor codebase resolving warnings and remove self-package imports

lib/model/dataHolder.dart

@@ -0,0 +1,23 @@
+
+import 'package:flutter/cupertino.dart';
+import 'package:localstore/localstore.dart';
+
+import '../api/apiResponse.dart';
+
+abstract class DataHolder extends ChangeNotifier {
+
+  CollectionRef storage(String path) {
+    return Localstore.instance.collection(path);
+  }
+
+  void run();
+  List<ApiResponse?> properties();
+
+  bool primaryLoading() {
+    for(ApiResponse? element in properties()) {
+      if(element == null) return true;
+    }
+    return false;
+    //return properties().where((element) => element != null).isEmpty;
+  }
+}