Closes #14575

* fix z-index to edge browsers

* fix sidebar on ie10

* Remove jump to message duplicated link

* Remove star message if the setting in disabled

* [FIX] Edit Message when down arrow is pressed.

* Prefer querying message on DOM tree over keeping an index

* Fix emoji replacing some chars

* Add tests

* Optmize emoji sprites

* Update unread property in the lastMessage room's object

* Remove uneeded query

Manual push by LingoHub User: Diego Sampaio.
Project: Rocket.Chat

Made with ❤ by https://lingohub.com

* Add secret property to setting

Co-authored-by: kb0304 <karanbedi0304@gmail.com>
Co-authored-by: Aaron Ogle <aaron@geekgonecrazy.com>

* Fixed missed global reference

* Add missed settings

* improved event emitter

* more changes

* Update WebRTCClass.js

* fix review

* Update index.js

* Update WebRTCClass.js

* Update WebRTCClass.js

* Revert webrtc api paths

* Reduced code complexity and added data validation

* Improved code quality

* Fix file import

* Skip user join and user leave messages when the user is not imported

* Fixing code for new eslint rules

* displaying notifications if user already exists

* remove commented code

* Fix logout custom script to run only in logout flow

* Revert changes in logged custom script

* Add description to custom scripts to make it more clear

* Add custom script for logout flow

* fix: make room description and topic text area

* cleanup: remove comments

* fix review

* Don't show unread count badge in burger menu if it is from the opened room

* Remove package-lock.json

* fix lint

* fix lint

* Query unread message count on burger template

* fix review

* Add tooltip to to notify user the action of back button in discussion

* Use conventional style of tooltip

* use a dictionary key.

* solved linting issue

* USe rc-tooltip--start

* fix review

* Slugify custom emoji names and alias before save it

* Fix lint