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