mitigate a potential DoS against websocket listeners
mitigate a potential DoS against websocket listeners

Websocket listeners would process an arbitrary number of invalid
(non-text or blank) messages without throttling. This imposes fakelag
on such messages by treating them as blank lines.

DanielOaks/oragono,oragono/oragono,oragono/oragono,DanielOaks/oragono,oragono/oragono