Seems a bit odd for each implementation to define a method that
*always* returns a static String[] when we can just pass that
up to the base class.

Just add a utility method to get the callback proxy instead.

Think this is a bit nicer, and is one less thing to have to change
if we switch to events.

All callbacks are now done through getCallback, which offers
type safety (gasp!) and is potentially extensible in the future
(wow!).

This means that nothing can depend on callbacks existing, so
there are two functional changes:

 - the parser will no longer disconnect automatically on failed
   pings; users have to listen for the event and handle it
   themselves;

 - the parser will no longer attempt to automatically use alt
   nicknames or create new nicknames on connection; users have to
   listen for the event and implement the logic themselves

Both of these were really weird anyway, as adding a listener (even
for debugging purposes) disabled the built-in behaviour.

ReadLine now parses tags out of incoming lines (tags are not currently passed through the encoder)

IRCParser.tokeniseLine() now understands that tags may exist at the start of a line and tokenises accordingly.
(In reality, the only time it ever sees them is during testing)

Parser processLine now looks for timestamps from tags from the ReadLine, not by parsing token[0] itself.

Made IRCReader tests a lot less annoying to work with.

Change-Id: I1d81392650d8193503621b2e69fbe66cd0eb736a
Reviewed-on: http://gerrit.dmdirc.com/4058
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager