worker.ServiceBase: honor new neo versions

• we need to store the neo-version inside the SW
• we need to store it inside the framework as well
• when an app connects, compare the versions
• if different, clear the SW related cache

for dist prod, the SW is storing the webpack based chunks. these can change for a new version and then break. in case you are running into it while exploring the online-examples, just unregister the SW inside the chrome devtools (top of the application tab)