Remove Hlt2Conf.framework module

The Hlt2Conf.framework module is a placeholder for things we likely won't have. I'd rather delete it now and reinstate it when we need it. Worst of all, lots of places import configurable from Hlt2Conf.framework, but they should be importing it from PyConf instead (Hlt2Conf.framework just forwards it from PyConf). These imports will have to be updated.