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Simplify max nicklen checks for hostmask parsing #523
This removes checking isupport NICKLEN for
The most serious issue here is for servers with ISUPPORT but no NICKLEN key, with nicks longer than 9 chars, where parsing just silently breaks and stuff like server-initiated JOINs fail to register.
This now always uses a limit of 50, which is arbitrary but probably a safe enough sanity check.