transform HibernateExtension into a subclass of HibernateExtensionImpl
bring implementation from ConsoleExtensionImpl into ConsoleExtension
remove empty class ConsoleExtensionImpl
HibernateExtension keeps track of ConsoleExtension
remove unused class ConsoleExtensionManager
remove unused class ConsoleExtensionDefinition
remove unused classes ConsoleExtensionX_Y and related extension point contributions
remove consoleextension extension point
remove hibernateextension extension point
remove unused ServiceLookup classes
remove schema/ from src.includes
remove plugin.xml from src.includes