Move old config interfaces into config folder.

Change-Id: I8d791451ead4b37f9181a9741e127cbc8b514d46
Depends-On: I94416680dfa9f0ee4896f5a6518889c6eb891909
Reviewed-on: http://gerrit.dmdirc.com/2754
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    28e3529 Chris Smith <chris@dmdirc.com>
            Handle stuff moving.

            Depends-On: I8d791451ead4b37f9181a9741e127cbc8b514d46
            Gerrit: http://gerrit.dmdirc.com/2753

Change-Id: I58c45749230e7c80c3ba709836a600aae5ad9dd6