This patch fixes two key issues:
* `?` is considered part of the URL, even if there might not be anything past it. I've seen people now putting spaces after URLs to get around this issue.
* `)` is also part of the URL, as well as `:` despite those not being valid characters at the end of URLs.
Make sure that the emote name is added inside the first paragraph rather than as an additional one.
Note alternate to network/neochat!632 because I didn'y realise @tfella had done a patch
CCBUG: 461837
