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/abstract-leveldown/test/manifest-test.js

@@ -0,0 +1,21 @@
+var suite = require('level-supports/test')
+
+module.exports = function (test, testCommon) {
+  test('setUp common', testCommon.setUp)
+
+  suite(test, testCommon)
+
+  test('manifest has status', function (t) {
+    var db = testCommon.factory()
+    t.is(db.supports.status, true)
+
+    // The semantics of not opening or closing a new db are unclear
+    // atm, so let's open it before closing, like every other test.
+    db.open(function (err) {
+      t.ifError(err, 'no open error')
+      db.close(t.end.bind(t))
+    })
+  })
+
+  test('tearDown', testCommon.tearDown)
+}