UX for handling Direct Messages

[ylecollen]

linked to IOS element-hq/element-ios#617

[ylecollen]

The android client has implemented the same UI than the web client i.e you have a dedicated section. Tap on it, retrieve the left rooms list and sync them.

[antikewl]

If we have agreed to mix the message types on iOS it would make sense to do the same on Android.

[antikewl]

https://zpl.io/Z1QsYAo

[giomfo]

design signed off