net-im/matterircd: Update to 0.27.0

ChangeLog: https://github.com/42wim/matterircd/releases/tag/v0.27.0

New features

• mastodon: Add mastodon support

Enhancement

• general: Add support for syntax highlighted code blocks
• mastodon: Add support for posting on timeline
• mattermost: Remove backwards compatibility support of last saved at state
• mattermost: Add support for tilde fenced code blocks
• mattermost: Reduce extra call to Mattermost server for files link

Bugfix

• irc: Fix splitting of lines for ACTIONs
• irc: Ignore when our user status is "offline"
• irc: Ignore special channels (&users and &messages)
• irc: Remove unnecessary topic setting on channel join
• irc: Remove extra new lines showing in debug logging
• irc: Only remove from channel for channels we're in on channel_deleted
• irc: Set correct IRC PRIVMSG nick for file events too
• irc: Ensure colon present for empty messages per IRC protocol/spec
• irc: Only flip between away and online when actually away or not
• irc: Add basic support for syntax highlighting in code blocks
• mattermost: Remove support for mattermost 5
• mattermost: Handle replies to posts part of threadst
• mattermost: Reduce calls to Mattermost server by caching replies

PR: 270123
Reported by: chalpin@cs.wisc.edu (maintainer)