FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/array-union/readme.md

@@ -0,0 +1,34 @@
+# array-union [![Build Status](https://travis-ci.org/sindresorhus/array-union.svg?branch=master)](https://travis-ci.org/sindresorhus/array-union)
+
+> Create an array of unique values, in order, from the input arrays
+
+
+## Install
+
+```
+$ npm install array-union
+```
+
+
+## Usage
+
+```js
+const arrayUnion = require('array-union');
+
+arrayUnion([1, 1, 2, 3], [2, 3]);
+//=> [1, 2, 3]
+
+arrayUnion(['foo', 'foo', 'bar']);
+//=> ['foo', 'bar']
+
+arrayUnion(['🐱', '🦄', '🐻'], ['🦄', '🌈']);
+//=> ['🐱', '🦄', '🐻', '🌈']
+
+arrayUnion(['🐱', '🦄'], ['🐻', '🦄'], ['🐶', '🌈', '🌈']);
+//=> ['🐱', '🦄', '🐻', '🐶', '🌈']
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)