refactored storage system that controller handles logic checks

lib/model/repositories/interfaces/task_repository.dart

@@ -1,15 +1,27 @@
 import '../../task.dart';
 
 abstract class TaskRepository {
+  // Create
+
+  Future<void> createTask(Task task);
+
+  Future<void> createTaskOrderEntry(String taskOrder);
+
+  // Read
+
   Future<List<Task>> loadTasks();
 
-  Future<Iterable<String>> loadTaskOrder();
+  Future<List<String>> loadTaskOrder();
 
-  Future<void> saveTaskOrder(List<String> taskOrder);
+  // Update
 
-  Future<void> saveTask(Task task);
+  Future<void> updateTask(Task task);
 
-  Future<void> saveTasks(List<Task> tasks);
+  Future<void> updateTaskOrder(List<String> taskOrder);
+
+  // Delete
 
   Future<void> deleteTask(Task task);
+
+  Future<void> deleteTaskOrderEntry(String taskOrderEntry);
 }