[NEW] Add register username screen

[FIX] Don't crash on missing Play Services.

[CHORE] Increment version to beta2

[FIX] Crash on ViewModelMapper

https://fabric.io/rocketchat3/android/apps/chat.rocket.android/issues/5ac2a7da36c7b235275e002c?time=last-twenty-four-hours

[CHORE] Increment version to beta1 & 2001

[FIX] Alerts the user about username creation using the web version.

Merge branch 'develop-2.x' of github.com:RocketChat/Rocket.Chat.Android into fix/oauth-crashes-when-using-new-user

[FIX] Logout on invalid token.

[NEW] Version check

[FIX] Show TwoFA screen if TOPT is required.

Merge branch 'new/version-check' of github.com:RocketChat/Rocket.Chat.Android into new/version-check

[NEW] Update app icon.

Move version check logic into its own abstract presenter and its UI callbacks to its own view and inherit all of them accordingly

It goes to TwoFA screen if TOPT is requiried.

Add missing parameter to ChatRoom