Support ignoring users or hostmasks

[j0rdan76]

Have a way to ignore hostmasks or users would be very beneficial to help specific users that keep spamming Ultros.

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[gdude2002]

This is going to require some protocol extensions; I'll look into it.

[rakiru]

I was planning this for a plugin. It should be doable that way, with the ability to either set an explicit mask, or ignore a user and have the plugin create a mask based on it. It can just cancel incoming message events from ignored users or something.

[gdude2002]

Well the point I'm making is that if we're going to do /proper/ ignores then the protocols should have a function that can match users based on strings.

[rakiru]

Ah right. Well, the IRC protocol has a utils thing that has suitable methods, and for mumble it's pretty much just nick comparison.
I had planned to before make protocol_inst.utils a thing on every protocol, but never got around to figuring out the best way to go about it. Having a base utils class with required functionality, then having protocols subclass that would probably be the best way. At that point, we might be better off just putting the functions in the protocol class itself, but the protocols are already pretty massive.

[gdude2002]

Well.. The base protocol classes are pretty small, the /actual/ protocols are large. But this definitely would be protocol-specific.

[gdude2002]

Blocked by #51