[NEW] Add support for initial Rich Messaging

Merge branch 'upstrem-button-action' of https://github.com/Shailesh351/Rocket.Chat.Android into Shailesh351-upstrem-button-action

[FIX] Building error

Merge branch 'upstrem-button-action' of https://github.com/Shailesh351/Rocket.Chat.Android into Shailesh351-upstrem-button-action

Down backing to 3.3.0-alpha05 due to a bug related with HandlerContext error. Fix wrong importing package.

Revert "[FIX] Temporary workaround for HandlerContext error."

Merge branch 'temp-button-action' into upstrem-button-action

[NEW] Analytics for Answer (Fabric).

layout_avatar duplicate removed

[FIX] Temporary workaround for HandlerContext error.

Taking care of not using Answers on FOSS version as well as only tracking if user has enabled the tracking.

layout_avatar duplicated in the layout

[FIX] File size validation

[NEW] Permission list

[NEW] Adds the admin panel.