* irc: add support for stateless bridging via draft/relaymsg
As discussed at https://github.com/42wim/matterbridge/issues/667#issuecomment-634214165
* irc: handle the draft/relaymsg tag in spoofed messages too
* Apply suggestions from code review
Co-authored-by: Wim <wim@42.be>
* Run gofmt on irc.go
* Document relaymsg in matterbridge.toml.sample
Co-authored-by: Wim <wim@42.be>