matterircd v0.27.1

Enhancement

• general: Allow multiple instances of matterircd (#523)
• mattermost: Support mattermost version 8, drop support for version 6 (#539)
• mattermost: Improve on logging and make consistent with matterclient (#510)
• mattermost: Add caching of last sent msgs and 'lastsent' service command to show them (#520)
• mattermost: Update reactions so they're part of threads (#530)

Bugfix

• mattermost: Add extra logging and fix return of wrong error (#529)

This release couldn't exist without the following contributors:
@hloeung