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/promise/polyfill-done.js

@@ -0,0 +1,12 @@
+// should work in any browser without browserify
+
+if (typeof Promise.prototype.done !== 'function') {
+  Promise.prototype.done = function (onFulfilled, onRejected) {
+    var self = arguments.length ? this.then.apply(this, arguments) : this
+    self.then(null, function (err) {
+      setTimeout(function () {
+        throw err
+      }, 0)
+    })
+  }
+}