[NEW] Show/update user profile

Revert "Merge branch 'develop-2.x' of https://github.com/RocketChat/Rocket.Chat.Android into feature/show-and-update-user-profile"

This reverts commit edb216b0, reversing
changes made to fcc334c2.

This reverts commit cc77517f.

[NEW] Logout and clear all data related to the current server

[NEW] Show attachments

Merge branch 'develop-2.x' of https://github.com/RocketChat/Rocket.Chat.Android into feature/show-and-update-user-profile

- Shows user avatar, username, display name and email.
- Update user display name, username and email.

Fixes on the SDK.

[NEW] Render system messages