- The function returns one of three values:
  1 - The user's preference (user.settings.preferences.<preference>)
  2 - The default system setting value (Default_User_Preferences_<preference>)
  3 - A default value passed as argument to the function

- Besides the introduction of the helper function:
  - Removes unused preferences (user.settings.preferences.unreadRoomsMode, user.settings.preferences.audioNotificationValue) and creates migration script (v105)
  - Implements some simple tests

* 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

* More sync with `more-streams`

* Use super instead of _initModel for models

* Change file encoding

* Fix last commit

* Fix data find

Updated regex that supports words using other than ASCII characters