Remove CommandManager.getMain().

Pass in the relevant dependencies in all cases except for the Quit
command, which does actually need a Main (but it can access it
statically, for now).

Change-Id: I056a0782b9d073622c04343ebba103d0880b9567
Reviewed-on: http://gerrit.dmdirc.com/2661
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: plugins (new commits)

plugins:
    84f6e25 Chris Smith <chris@dmdirc.com>
            Simplify getPluginManager calls in the swing UI.

            No point calling getMain().getPluginManager() when the controller
            has a nice reference you can get at.

            Gerrit: http://gerrit.dmdirc.com/2663

Change-Id: I876f5121631aaf684d3726043accf3d20f795982