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/stream-chain/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "stream-chain",
+  "version": "2.2.5",
+  "description": "Chain functions as transform streams.",
+  "main": "index.js",
+  "scripts": {
+    "debug": "node --inspect-brk tests/tests.js",
+    "test": "node tests/tests.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/uhop/stream-chain.git"
+  },
+  "keywords": [
+    "stream",
+    "chain"
+  ],
+  "author": "Eugene Lazutkin <eugene.lazutkin@gmail.com> (http://lazutkin.com/)",
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/uhop/stream-chain/issues"
+  },
+  "homepage": "https://github.com/uhop/stream-chain#readme",
+  "devDependencies": {
+    "heya-unit": "^0.3.0"
+  },
+  "files": [
+    "/*.js",
+    "/utils"
+  ]
+}