v12.2.0-rc.1

Full Changelog

• Update ESLint config
  #1810
• Clean up Event.clearEvent handling to fix a bug where malformed events with
  falsey content wouldn't be considered decrypted
  #1807
• Update matrix-org-eslint-plugin and tighten max warning limit
  #1806
• Initial MSC3244 support and type cleanup
  #1745
• Functional members
  #1771
• yarn upgrade
  #1802
• Improve calculateRoomName performances by using Intl.Collator
  #1801
• Conform to new typescript eslint rules
  #1798
• Actually print IndexedDB command error if there is one
  #1799
• Update eslint-plugin-matrix-org
  #1796
• Add minimal types for "notification settings" UI
  #1778
• Switch from url to URL constructor
  #1791
• Switch callEventHandler from listening on event to Room.timeline
  #1789
• Contributing guidelines for new changelog generation
  #1787
• Fix link to CONTRIBUTING.md
  #1786
• Use an unstable prefix for MSC2885: Hidden read receipts
  #1788
• Standardise spelling and casing of homeserver, identity server, and
  integration manager
  #1782
• Convert CONTRIBUTING to markdown
  #1785
• Use webpack worker-loader instead of homegrown hack
  #1780
• Convert IndexedDB store & worker to Typescript
  #1779
• Expose MatrixEvent's internal clearEvent as a function
  #1784
• Improve and consolidate typing
  #1777