v21.1.0-rc.1

✨ Features

• Loading threads with server-side assistance (#2735). Contributed by @justjanne.
• Support sign in + E2EE set up using QR code implementing MSC3886, MSC3903 and MSC3906 (#2747). Contributed by @hughns.

🐛 Bug Fixes

• Replace instanceof Array with Array.isArray (#2812). Fixes #2811.
• Emit UnreadNotification event on notifications reset (#2804). Fixes element-hq/element-web#23590.
• Fix incorrect prevEv being sent in ClientEvent.AccountData events (#2794).
• Fix build error caused by wrong ts-strict improvements (#2783). Contributed by @justjanne.
• Encryption should not hinder verification (#2734).