Update submodules: plugins (new commits)

plugins:
    534701b Greg Holmes <greg@dmdirc.com>
            Fix potential NPE in action editor dialog.

            Gerrit: http://gerrit.dmdirc.com/3976

Change-Id: I2686524661c895c960d924411bb93dd6e663c557
Update submodules: parser (new commits)

parser:
    e1a4076 Chris Smith <chris@dmdirc.com>
            Move IRCAuthenticator into common, rename.

            Gerrit: http://gerrit.dmdirc.com/3977

Change-Id: Ia1ce6a48ac6ddb4f2692da50d058ddd0aed659c5