Use util from maven.

Change-Id: Id161c77c7414b278876041fcd6a627444f5552bb
Depends-On: I579afbde086d5761fe3743b23f4655cb4ea5b8df
Reviewed-on: http://gerrit.dmdirc.com/3910
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: util (new commits)

util:
    c200f9b Chris Smith <chris@dmdirc.com>
            Gradle the util project.

            Gerrit: http://gerrit.dmdirc.com/3909

Change-Id: Id9b230503e0cd8bcdf6fa42b70b2d4acc99d9518