Quassel IRC

Quassel has this problem where it will auto-assume all networks use the prefixes of qaohv(~&@%) or a subset of that, even freenode/efnet that only use +ov. This is due to the _prefix and _prefixModes strings being set to the fallback defaults, triggered by the identd/hostname notices sent before RPL_ISUPPORT. Normally, this would of been fine, however, certain ircd's like ShadowIRCd use ! instead of & for chmode +a (default when owner +q does not exist). The attached patch will set _prefix/_prefixModes AFTER ircd sends 005 RPL_ISUPPORT to correct this behavior.