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/set-blocking/CHANGELOG.md

@@ -0,0 +1,26 @@
+# Change Log
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+<a name="2.0.0"></a>
+# [2.0.0](https://github.com/yargs/set-blocking/compare/v1.0.0...v2.0.0) (2016-05-17)
+
+
+### Features
+
+* add an isTTY check ([#3](https://github.com/yargs/set-blocking/issues/3)) ([66ce277](https://github.com/yargs/set-blocking/commit/66ce277))
+
+
+### BREAKING CHANGES
+
+* stdio/stderr will not be set to blocking if isTTY === false
+
+
+
+<a name="1.0.0"></a>
+# 1.0.0 (2016-05-14)
+
+
+### Features
+
+* implemented shim for stream._handle.setBlocking ([6bde0c0](https://github.com/yargs/set-blocking/commit/6bde0c0))