* 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

This reverts commit 9c181604.

Avoid setting content-disposition header to images. Also deliver download files with original file name.