Skinny Modules -- not just WARs

Currently it is only possible to have the plugin filter WARs to make them 'skinny', however this could be very useful for other modules as well!

In my project I have both a WAR and a SAR that should share several libraries. As standalone artifacts, they should both package it themselves, but in the deployed EAR I get classloading-errors when they don't have the libs shared in the EAR.

I traced a solution to the method 'EarModule.getLibDir()', which is only implemented with a value in the 'WebModule'-subclass.
Since I am not familiar with all the module-types, I attached a solution that ONLY handles the SarModule, but this can probably used in all other Modules that contain libs as well.