WFCORE-135: remove custom runtime permissions

The permission class is a generic runtime permission, i.e. no actions, you either have permission or not in runtime, then the specific purpose is defined by the each instance's "name" and, I guess, it's declaration javadoc. Wasn't the issue the elimination of illegal/invalid JDK RuntimePermission? I think (re)definition of instances should probably be left to additional issues per module.