v0.4.0

Release post: https://mau.fi/blog/2025-04-mautrix-release/

• Added support for automatic unbans (thanks to @nexy7574 in #2].
• Merged separate user and server ban commands into one with validation to prevent banning invalid entities.
• Added !send-as-bot command to send a message to a room as the moderation bot.
• Added support for redacting individual events with !redact command.
• Added !redact-recent command to redact all recent messages in a room.
• Added !powerlevel command to change a power level in rooms.
• Added !help command to view available commands.
• Added !search command to search for policies using glob patterns.
• Added support for redacting messages on all server implementations (thanks to @nexy7574 in #16).
• Fixed server ban evaluation to ignore port numbers as per the spec.