Improve how the importer progress gets sent to the client and change the structure of the importers imports

[FIX] Slack import failing and not being able to be restarted

[FIX] Slack import failing and not being able to be restarted
# Conflicts:
#	packages/rocketchat-i18n/i18n/en.i18n.json

* Rc main content header 

work in progress

* header redesign

work in progress

* Clean up some css and fix burger

* Fix reviews

* Apply the new header to some admin pages

* Start using typography on fonts

* add the new header to more pages

* add more new headers

* Fix admin buttons

* add the new header to the account screens

and fix some flexs

* fix profile header and use new burger

* Add favorite star fill

* allign preferences contents to center

* Put description under the title

* fix overflow on channel topic and title

* start making the header a component

* move channel header template to the new one

and fix burger menu

* Make the header a modular component

* fix some buttons on integrations

* add channel icons and fix star fill

* fix line height and css lint

* add livechat icon

* fix part of the tests

* fix tests

* add a max-width to header

* hide room image on channels

* Fix reviews and some issues with firefox

also remove a console.log()

* fix mobile max width

* Fix Reviews

reduce some elements and try to improve the naming of elements

* Fix realNames on Header

* [FIX] After deleting the room, cache is not synchronizing

* Put delete action on another popover group

* check if user can delete

* [FIX] Email Subjects not being sent

* fix on android

* fix for ios

* Tab Bar Icons moved to header

* remove sidebar header on admin embedded version

* fix lint issue

* remove console.log

* contextual bar header

* remove last activity

* Update meteor to 1.5.2.2-rc.0

* Fix missing i18n translations

* fix header on administration

* migration 101

* fix admin view header

* remove accountBox from admin menu

* add sidebar flex title and icons

* smaller accountBox

* Fix some tests and skip others

skipping due some features that need fixing

* Update sidebarItem.html

* unify unread and mentions badge

* make sidebar item width 100%

* fixed tests

* LingoHub Update 

Manual push by LingoHub User: Gabriel Engel.
Project: Rocket.Chat

Made with  by https://lingohub.com

* meteor update --all-packages

* LingoHub Update 

Manual push by LingoHub User: Gabriel Engel.
Project: Rocket.Chat

Made with  by https://lingohub.com

* meteor update --release 1.5.2.2

* [FIX] Vairous LDAP issues & add pagination

* LingoHub Update 

Manual push by LingoHub User: Rodrigo Nascimento.
Project: Rocket.Chat

Made with  by https://lingohub.com

* LingoHub Update 

Manual push by LingoHub User: Rodrigo Nascimento.
Project: Rocket.Chat

Made with  by https://lingohub.com

* contextual-bar template

* fix stylelinty

* fix icons

[FIX] Csv importer: work with more problematic data

Interface clean up, with users&channels being allowed to be empty for
CSV import.

[FIX] Fix file upload on Slack import
# Conflicts:
#	packages/rocketchat-importer/server/classes/ImporterBase.js

Closes #7447

* 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

* [WIP] Igloczek styles cleanup (#5354)

* WIP: Styles architecture cleanup

* Fix build

* Move the reset to css on client

* moving some CSS from api.addAssets to api.addFiles

* moving more files to built time compilers

* Restoring clearfix

* moving more files to built time compilers

* moving more files to built time compilers

* move fontello to theme package

* Renaming files to preserve git history

* Renaming files to preserve git history

* using min to preserve history

* Fix lint

* organizing

* Renaming files to preserve git history

* Renaming files to preserve git history

* Fix lint

* Fix lint

* Renaming files to preserve git history

* Moving another less file to cue compiled at build time

* Fix lint

* Moving another less file to be compiled at build time

* adding some part of lesshat into temp mixings

* Put transitions back with some temp redundant mixing

* commenting out unused mixings

* removed unused mixings from lesshat

* Fix lint