Update submodules: plugins (new commits)

plugins:
    686521d Chris Smith <chris@dmdirc.com>
            Kill unused method.

            Gerrit: http://gerrit.dmdirc.com/3281

    2f855ed Chris Smith <chris@dmdirc.com>
            Remove some deprecations.

            This also fixes the param mode panel incorrectly using the global config.
            Up until now it was using the global config, so only default mode aliases
            would have been available, not ircd/network-specific ones.

            Fortunately there aren't many param modes...

            Fixes-issue: CLIENT-481
            Gerrit: http://gerrit.dmdirc.com/3280

Change-Id: I2f301f0ee0a7f96d46d8ce1e754b8998f9275e70
Update submodules: plugins (new commits)

plugins:
    c7aa0fa Chris Smith <chris@dmdirc.com>
            Tidy up window menu related stuff.

            Gerrit: http://gerrit.dmdirc.com/3282

Change-Id: I8864852e3dff5b43bca00d30428dd85e38720e9e