[Standards] Update XEP-377

Hey, JoinJabber is interested in possibly hosting an rtbl instance and holding domains accountable to our CoC. With that in mind the XEP-377 seems to be inadequate. Specifically here: https://xmpp.org/extensions/xep-0377.html#payload It mentions only: *urn:xmpp:reporting:spam* Used for reporting a JID that is sending unwanted messages. *urn:xmpp:reporting:abuse* Used for reporting general abuse. That is severely limiting. For example what if somebody sends hate speech? or transphobia? or racism? or moderation is non existent in this server? One solution when i talked about was removing the limitation of being only two and allowing any label basically. Wdyt? MSavoritias