Read server's ISUPPORT and get prefix there

[14mRh4X0r]

Also stores the ISUPPORT parameters in an easily accessible HashMap and fixes a slight parsing bug with IRCv3 message tags

[indrora]

There's deeper places that this should be handled.

Notably, pIRCbot is hard-coded to say that v means + and o means @.

[indrora]

Second quick check: how well does the IETF document line up with http://www.irc.org/tech_docs/005.html ?

[14mRh4X0r]

I'll update this pull request later with an implementation on a deeper level. The IETF document matches the irc.org doc as far as I can tell, but the latter does provide more information about real-world implementations.

[indrora]

I'd like IRCService to be able to tell what the ISUPPORT blocks state. This way, we can strip out the nick prefixes (and handle things like the absolutely strange $foo channel type that I encountered)

[14mRh4X0r]

As my local version is now, PircBot has a Map<String, String> getISupport(). It requires more rewriting than I anticipated.