Multi-line message grouping
Since MOTD is already received as a single multi-line message (issue #2413 (closed)), and given that outbound multi-line messages are sent as multiple one-line IRC messages (commit bfcc9cdc), it may make sense to group inbound IRC messages received in a short period of time into a multi-line XMPP message.
This would mitigate the verbosity on connect (issue #3206).
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