* [IMPROVEMENT] Update user presence endpoint

* Use `from` parameter in case of reconnection

We need to migrate from deprecated react-native-fabric to react-native-firebase.
This PR enables following Firebase features:
* Analytics
* Crashlytics
* Performance

It also tracks screen view without the necessity of HOC.

Future work:
I won't do it in this PR because it's large enough, but we need to log more app events, like 'sent_message', 'open_admin', 'media_upload', etc.

* Add toggle markdown to settings

* Remove unused translation

- Refactored Message component to use React.memo and re-render only what's necessary
- Added a test mode to toggle markdown parse by long press drawer (it'll be removed in the next release)

* removed toast from ios

* changed showToast to showAlert

* removed from android

* fix lint

* conflict resolved

* fixed lint

* Fix toast position

* Change toast style

* Use followMessage from rest

* Temporary disable some visual toast tests

* Unnecessary lib version change

On Room Actions, we have Files, Mentions, Starred and Pinned.
They have similar APIs and logic.
All of those could be merged into one generic view (MessagesView).
Maybe even Search could be in this merge.

Note: They're similar, but have own rules (unstar, unpin, etc).

This change may reduce 1MB to our release bundle size, since we're going to remove a lot of boilerplate.

* Tweaks on sequential threads messages

* Update tests

* Fix quote

* Prevent from deleting thread start message when positioned inside the thread

* Remove thread listener from RightButtons

* Fix error on thread start parse

* Stop parsing threads on render

* Check replied thread only if necessary

* Fix messages don't displaying

* Fix threads e2e

* RoomsListView.updateState slice

* Stop fetching hidden messages on threads

* Set initialNumToRender to 5

* Fetch roles from rest api

* Fix RoomInfoView role get

* Remove roles from redux

* Update emoji endpoint

* Use React.memo on Markdown

* Support RC versions lower than 0.75.0

* Realm migration

Closes #826
Closes #827
Closes #828
Closes #829
Closes #830
Closes #831
Closes #832
Closes #833

* New Icons

* Remove unused assets

* Change send icon

* Layout tweaks

* Refactor Status

* Styles changed

* User layout fix

* Separator layout changes

* Sidebar status layout fix

* Fix Message.onLongPress issue

* Fix code markdown
Closes https://github.com/RocketChat/Rocket.Chat.ReactNative/issues/625

* Status lint

* Fix tests

* Navigation debounce

* RoomActions icons

* Space between components

* Group text

* Update tests

* Remove listeners from room
* Properly close connections on change server
* Minor layout change on connecting badge

[FIX] Start loop searching for rooms updates only when connection goes down and SDK has userId (#613)

Shows "Updating..." when requesting rooms from Rest API.

Creates Icons class to manage when to load icons from native side or react-native-vector-icons.
It also fixes `react-native run-android` #517 

* Add Navigation class

* Place Drawer.js logic inside of Navigation

* Load less views at startup

* shouldComponentUpdate

* Rooms list shouldcomponentupdate

* RoomView shouldComponentUpdate

* Messagebox and Message shouldComponentUpdate

* EmojiPicker shouldComponentUpdate

* RoomActions shouldComponentUpdate

* Room info shouldComponentUpdate

* Update RNN

* Use only one Flatlist if none group filter is selected

* Update fix

* shouldComponentUpdate

* Bug fixes

* ListView changes

* Bug fix

* render list bug fix

* Changes on public channels

* - RoomView saga leak removed
- Join room e2e tests added

* Rest versions

* Method call versions

* Min RocketChat version alert