0.21.1.1011 beta

Minor changes

- Search contacts by username, when creating a chat / group / channel
- Slightly reduced memory usage by removing unused components

Bugfixes

- Rudimentary warning prompt, when navigating back to application directory
- Rare crash on chats screen after sign-in
- 5 emojis are displaying not properly
- Crash when trying to play audio
- Only one map preview is displayed, when multiple arrive
- Can't open some document types on secondary accounts