Update submodules: plugins (new commits)

plugins:
    37d3c18 Chris Smith <chris@dmdirc.com>
            Remove UrlBuilder.buildUrl calls.

            Gerrit: http://gerrit.dmdirc.com/2836

Change-Id: I5f701673d9e4bec9a23f4d7c4078151d05ca7ea8
Update submodules: plugins (new commits)

plugins:
    87cd3e2 Chris Smith <chris@dmdirc.com>
            Desingleton DccCommandParser.

            Can't see why it was a singleton, really.

            Gerrit: http://gerrit.dmdirc.com/2838

Change-Id: I853426b1b1f13d1032195f4bbccd971fad7f001c
Remove unused method.

Change-Id: I2d495cf163c7e300b9e894987147d708a9706764
Reviewed-on: http://gerrit.dmdirc.com/2837
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager