Update submodules: plugins (new commits)

plugins:
    bfe40a2 Greg Holmes <greg@dmdirc.com>
            Fix funky alias delete behaviour.

            Gerrit: http://gerrit.dmdirc.com/3562

Change-Id: I6c5bdba775276d30dabe56727e7214ebf82189ae
Add default aliases and extract them.

Change-Id: If6079d951f7b6b5379043ffb9772d757fef9837b
Reviewed-on: http://gerrit.dmdirc.com/3563
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>