defaulting strength on wireless cards to max, because it's way too likely to forget setting the strength; also returning foreground and background color from gpu.get
major clean up, clearing up separation of "core" and additional stuff a little by introducing an interface that allows getting the orientation of the container for item components; little bit of refactoring; killed the util.Persistable trait, since it was only confusing and unneeded (I just didn't realize traits could extend classes back then)