v34.0.0-rc.0

🚨 BREAKING CHANGES

• Fetch capabilities in the background (#4246). Contributed by @dbkr.

✨ Features

• Prefix the user+device state key if needed (#4262). Contributed by @AndrewFerr.
• Use legacy call membership if anyone else is (#4260). Contributed by @AndrewFerr.
• Fetch capabilities in the background (#4246). Contributed by @dbkr.
• Use server name instead of homeserver url to allow well-known lookups during QR OIDC reciprocation (#4233). Contributed by @t3chguy.
• Add via parameter for MSC4156 (#4247). Contributed by @Johennes.
• Make the js-sdk compatible with MSC preferred foci and active focus. (#4195). Contributed by @toger5.
• Replace usages of setImmediate with setTimeout for wider compatibility (#4240). Contributed by @t3chguy.

🐛 Bug Fixes

• Element-R: Fix resource leaks in verification logic (#4263). Contributed by @richvdh.
• Upgrade Rust Crypto SDK to 6.1.0 (#4261). Contributed by @richvdh.
• Correctly transform base64 with multiple instances of + or / (#4252). Contributed by @robintown.
• Work around spec bug for m.room.avatar state event content type (#4245). Contributed by @t3chguy.