[NEW] Room info and Room info edit (#254)

* - Block user
- Load room members async
- fixed reactive change of room's read only flag

* Snippet messages

* - Room files
- Dismiss Video component on back button press
- Improvements on Image component

* Improvement on Video component

* Leave room

* Missing message types

* lint

* - Room info (read only)
- Missing message types

* Room info scroll

* - Tap on room header opens room info
- Layout tweaks

* - Room info edit
- iOS Toast fixed

* - Style not implemented actions as disabled

* Edit room permission

* - Save all room settings in a single call
- Implemented roomType and readOnly

* - Allow reacting when room is read only

* Message type added: room_changed_privacy

* Erase room

* Created TextInput and SwitchContainer components for reuse and readability

* - hasPermission method

* - Archive/Unarchive room
- Set Join Code

* Twitter keyboard type on iOS

* Archived room

* reactWhenReadOnly permission on message

* Active users refactored

* User roles

* - Subscribe to roles (in order to get role description info: e.g. 'core-team' to 'Rocket.Chat Team')
- Save roles to realm (for offline access)
- Save roles to redux (and get data from realm on app init)

* Lint

* code style