[NEW] Group chats by favorites

[IMPROVEMENT] Delete account dialog UI

[FIX] Saving unsend message

[NEW] Add erase feature in drawing

[FIX] Mistakes on the README.md.

[FIX] Fixes app crashes when channel Details button is clicked while scrolling

[FIX] Added default background image for avatar image view

[FIX] Chatroom showing empty messages in RTL layout

[FIX] About fragment app bar title is change from "About" to "Rocket.Chat" on rotate.

[FIX] App bar title changes when rotating the screen.

[FIX] Show only email apps for sending email

[FIX] Null username being shown while sending messages without internet

[FIX] Avatar cache bug

[I18n] Fix typo in Russian language file