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/vlq/CHANGELOG.md

@@ -0,0 +1,29 @@
+# changelog
+
+## 1.0.1
+
+* Handle overflow cases ([#9](https://github.com/Rich-Harris/vlq/pull/9))
+
+## 1.0.0
+
+* Rewrite in TypeScript, include definitions in package ([#6](https://github.com/Rich-Harris/vlq/pull/6))
+
+## 0.2.3
+
+* Add LICENSE to npm package
+
+## 0.2.2
+
+* Expose `pkg.module`, not `jsnext:main`
+
+## 0.2.1
+
+* Performance boost - vlq no longer checks that you've passed a number or an array into `vlq.encode()`, making it significantly faster
+
+## 0.2.0
+
+* Author as ES6 module, accessible to ES6-aware systems via the `jsnext:main` field in `package.json`
+
+## 0.1.0
+
+* First release