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/siginfo/test.js

@@ -0,0 +1,16 @@
+var siginfo = require('.')
+var pkg = require('./package.json')
+
+var stop = siginfo(function () {
+  console.dir({
+    version: pkg.version,
+    uptime: process.uptime()
+  })
+})
+
+process.stdout.resume()
+
+setTimeout(function () {
+  stop()
+  process.exit(0)
+}, 2000)