[FIX] Custom OAuth url

[IMPROVEMENT] Flat layout structure in message_list.xml

merge

[NEW] Notify new message in the chat room.

[FIX] Message retain

[IMPROVEMENT] Added project improvements.

The authorizePath can include the host itself, so before concacting the host with the authorizePath check if the host is already present in the authorizePath.

Merge branch 'develop' of github.com:RocketChat/Rocket.Chat.Android into improvement/draw-and-app-modularization

Merge

[FEATURE] DB Spotlight + fixes

[FIX] Fix Reply with attachment

[NEW] Send message with attachments

[IMPROVEMENT] Hindi translation

Better app modularization. Processing the draw image in background as well as handling possible errors.