Pass in CommandControllers to some plugin commands

I got bored about half way through, so more to go at some point.

Change-Id: Id1d18950a69090439ee66ae9e5c8ae874bd30fc4
Reviewed-on: http://gerrit.dmdirc.com/2807
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>