Fix: Copy ID copies wrong ID.
Messaging: Add context menu to avatar / username.

Feature: Remember what channel was opened last.
Channels: ESC to focus message box / cancel editing.

Servers: Fix various issues relating to voice channels.

Support re-connecting after going / starting offline.

Add profile links / app links back.
Add quoting / mentioning back.

Modularise server header.

Add bars + header + sidebar to channels.