stateAndPluginLocalAndPrimaryFeature/PrimaryFeaturePreference = From the primary feature plugin directory via the plugin stateAndPluginLocalAndPrimaryFeature
org.eclipse.core.runtime/SomeRandomPreference = For the runtime plugin only
stateAndPluginLocalAndPrimaryFeature/commonStateAndPluginLocalAndPrimaryFeaturePreference = Common preference from the primary feature of plugin stateAndPluginLocalAndPrimaryFeature