Base model refactor (#810)

* Big upgrades

* WIP: Stash

* Stash, 30 flow errors left

* Downgrade mobx

* WIP

* When I understand the difference between class and instance methods

* 💚

* Fixes: File import
Model saving edge cases
pinning and starring docs
Collection editing
Upgrade mobx devtools

* Notification settings saving works

* Disabled settings

* Document mailer

* Working notifications

* Colletion created notification
Ensure not notified for own actions

* Tidy up

* Document updated event only for document creation
Add indexes
Notification setting on user creation

* Commentary

* Fixed: Notification setting on signup

* Fix document move / duplicate stale data
Add BaseModel.refresh method

* Fixes: Title in sidebar not updated after editing document

* 💚

* Improve / restore error handling
Better handle offline errors

* 👕

shared/utils/naturalSort.js

@@ -2,7 +2,7 @@
 import { sortBy } from 'lodash';
 import naturalSort from 'natural-sort';
 
-export default (sortableArray: Object[], key: string) => {
+export default (sortableArray: *, key: string): * => {
   if (!sortableArray) return [];
 
   let keys = sortableArray.map(object => object[key]);