[BREAK] The property "settings" is no longer available to regular users via rest api

Move the helpers out of the individual api versions, this way others can make usage of them without duplicating code

Fix: Unneeded warning in payload of REST API calls

Fix: Can’t login using LDAP via REST

Add chat.search, chat.sendMessage, POST push.token, fix DELETE push.token, and fix the structure of the rooms/subscriptions.get results

(cherry picked from commit cf7d37fe)

[FIX] Duplicate code in rest api letting in a few bugs with the rest api

[FIX] Duplicate code in rest api letting in a few bugs with the rest api
# Conflicts:
#	packages/rocketchat-api/server/api.js
#	packages/rocketchat-api/server/v1/channels.js
#	packages/rocketchat-api/server/v1/groups.js
#	packages/rocketchat-api/server/v1/im.js

Add a messages endpoint which supports pagination like the other endpoints. Rework the direct messages endpoints to support username instead of room id

* 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

* ESLint add rule `object-shorthand`

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

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation