Moved class StandardContainerComponent can result in problems in case an endproject has defined the class explicitly

For container component, you do not need to set the "hst:componentclassname" since it gets by default the StandardContainerComponent, unless you specify a custom StandardContainerComponent. What however fails in 13.0.0 if you had specified it explicitly to be "org.hippoecm.hst.pagecomposer.builtin.components.StandardContainerComponent" since the class moved!