Update submodules: plugins (new commits)

plugins:
    47e6656 Chris Smith <chris@dmdirc.com>
            Pass in AliasWrapper to the AMD.

            Gerrit: http://gerrit.dmdirc.com/2791

Change-Id: I49593618a4ce5bc0be4f0457c3a5cd937bb17e10
Remove static AliasWrapper ref.

Change-Id: I4c464fae85be6822d6f03e243c1e3d874dcbff92
Reviewed-on: http://gerrit.dmdirc.com/2790
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager