[RELEASE] Merge DEVELOP into BETA

[FIX] View less/view more button getting lost

[NEW] Redesign authentication views

[FIX] Two factor authentication when using email.

[NEW] Add room_privacy_changed system message handling

[FEATURE] Initial message db support

Revert "[PROJECT] Bump Android gradle plugin to 3.2.0 stable version"

 To be improved soon.

To make it better on some densities.

[FIX] Fix the logic to render multiple mentions to the same user