Frontend needs to stop hardcoding prefix characters

[grawity]

Currently, smuxi's IRC protocol code obtains all known prefixes (e.g. PREFIX=(qaohv)~&@%+) from the RPL_ISUPPORT numeric.

And yet, the GNOME IRC frontend completely ignores this, and has five prefix characters hardcoded. This completely defeats the purpose of ISUPPORT, and outright breaks on networks where the prefix characters are not exactly ~&@%+ – for example, euIRC, which has *!@%+ for those modes, so smuxi shows ~nick where it should show *nick, and sometimes even thinks the * or ! is part of someone's nick. (Not that I use euIRC or anything, but still.) Or networks that have more than five of them. (Can't remember which but inspircd can be configured like that.)

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