[Bug] Option to turn off update warning
First, I'm not even using paddy on this symbol or even in this document which is weird. 

But I'd like to turn off this warning that occurs when you edit a symbol with 10 or more instances. 
![image](https://user-images.githubusercontent.com/2779211/36760101-98bfb3f2-1be7-11e8-8425-afb439f228ea.png)


Annoying if you're working on existing symbol and you have to click this every time even if you don't make changes. And there is no slow down for me even with 30 symbols

