[FIX] Last sent message reoccurs in textbox

Provide implementation for the confirmation dialogs on leave and hide

Color variables migration

Room definitions are more typed but extended classes have full control over their definitions beyound the expected.

* 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