Added error checking for config.json

src/ecs/ECS.cpp

@@ -12,3 +12,8 @@ void Entity::addGroup(Group mGroup)
 	groupBitset[mGroup] = true;
 	manager.AddToGroup(this, mGroup);
 }
+void Entity::setTag(std::string t)
+{
+    this->tag = t;
+}
+