[FIX] Check if fragment already has a view and is still attached

[FIX] File list

[FIX] Open DM showing Join Chat button

[NEW] Hop to chat room when tapping on notification

When converting Users to ChatRooms show the username first in order to better identify users with the same full name

[FIX] Wrong shown pinned/favorite messages with attachment 

[FIX] Composer buttons vanishing in thin air

[FIX] Download button.

[FIX] Offline messaging not working properly

subscribeTypingStatus which is blocking the current execution thread
from continuing and thus, from making a call to subscribeState function.

[IMPROVEMENT] FCM in place of GCM

Revert "[FIX] Better multi-server support for push notifications"

Revert "[NEW] Wear Module"

[NEW] Wear Module

[FIX] Better multi-server support for push notifications

[IMPROVEMENT] Shows only the chat icon on the chat room view.

[NEW] File list