Try to keep track of channel keys (Close Issue #108)
- Parses outgoing JOINs to try and guess keys before we get the MODE reply.
- Parsing algorithm based on Quakenet/Hybrid handling of keys.
- Keys are swallowed from the key-list for EVERY channel that is
to join, even if it is not needed, so you would need to use
"JOIN #Foo,#Bar,#Baz Foo,,Baz" to join keyed channels #Foo and #Baz.
- Key changes by mode +k and -k will be tracked.
- Ignores attempts to set the key as "*" if we know a "better" key.
- Side effect: If the key is actually set to "*" we can only learn it if that
is what we join with, or it gets changed to that from no-key.