Co-authored-by: Tasso Evangelista <tasso.evangelista@rocket.chat>

* Add escapeHTML helper

* Add unescapeHTML helper

* Move helpers to /lib

* Use the helpers

* feat/message-parsing

* Make escapeRegExp match its underscore.string counterpart

* Remove superfluous parameter

* Remove redundant function definition

* Work around oembed bug

* Refactor autolinker initialization

* Refactor autolinker initialization

* Refactor hexcolor initialization

* Refactor emoji initialization

* Refactor highlight-words initialization

* Refactor issuelinks initialization

* Refactor mentions initialization

* Refactor mapview initialization

* Remove trackSettingsChange module

* Remove some s.trim() usage

* Move renderMessageBody

* Move some renderMessage startup scripts

* Refactor katex startup

* Move some renderMessage startup scripts

* Move some spotify modules

* Fix reactivity

* Move spotify initialization

* Move markdown initialization

* Update Mocha configuration

* Rearrange renderMessageBody signature

* Move markdown template helpers

* Remove markdown template helpers

* Extract options from markdown

* Fix import

* Render message.location's mapview on message template

* Conditionally render message location

Co-authored-by: Guilherme Gazzo <guilherme@gazzo.xyz>

* First wave of removal of Meteor global

* Second wave of removal of Meteor global

* Third wave of removal of Meteor global

* Fix tests

* Remove global variable SHA256

* Remove global variable WebApp

* Remove global variable EJSON

* Remove global variable Email

* Remove global variable HTTP

* Remove global variable Random

* Remove global variable ReactiveDict

* Remove global variable ReactiveVar

* Remove global variable Accounts

* Remove globals variables Match and check

* Remove global variable Mongo

* Remove global variable moment

* Remove global variable Tracker

* Remove global variable Blaze

* Remove global variables FlowRouter and BlazeLayout

* Add FlowRouter to eslint global in tests file

* Remove global variable DDPRateLimiter

* Remove global variable Session

* Remove global variable UAParser

* Remove global variable Promise

* Remove global variable Reload

* Remove global variable CryptoJS

* Remove global variable Template

* Remove global variable TAPi18n

* Remove global variable TAPi18next

* Fix ESLint

* Add ESLint rule `prefer-template`

* Add ESLint rule `template-curly-spacing `

* ESLint ignore rocketchat-livechat/assets/rocket-livechat.js

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation

* possible fix to images in subdir

* fix to images in subdir

* fix type of key to loginTokenKey

* change to method of getting login token to use _storedLoginToken

* add back escape function

This fixes problems we had with file uploads on Microsft Edge