chore(release): Add changelog for 20.0.0

[nickvergessen]

20.0.0 – 2024-09-14

Added

• Federated calls
• Add a task counter for to-do lists in "Note to self" messages
• Allow editing "Note to self" messages forever
• Show blurhash while loading attachments
• Show upcoming event information in conversation
• Banning users and guests
• Allow to prevent @all mentions for non-moderators
• Add button to show smart picker
• Dispatch events when enabling or disabling bots
• Show user status messages of other local users in a federated conversation

Changed

• Requires Nextcloud 30
• High-performance backend with federation support is required (Version 2.0.0 or later)
• API performance improvements
• Dynamic order of tiles in a call to prioritize participants with audio or video
• Automatically lower raised hand when participant speaks
• Show confirmation dialog when removing a participant
• Show description when listing open conversations
• Outline the participant count when trying to mention everyone
• Show out-of-office replacement in the out-of-office message

Known issues

• Federation requires the High-performance backend on both servers
• Federation requires Talk 20 on both servers

[nickvergessen]

/backport to stable30