Update submodules: util (new commits)

util:
    0e02c17 Chris Smith <chris@dmdirc.com>
            Add StringUtils class + tests.

            These are from the TextPane, but seem fairly general purpose.

            Gerrit: http://gerrit.dmdirc.com/4081

Change-Id: I00e81060bacb492af6ebb3dfcb4fd398ed316cb9