FIX: application update command should update packaged app manifest and content 

- this change should fix #269
- introduce a temporary webappsActor renamed to simulatorwebappsActor to fix a couple of issues with reinstall application using its install command
- kill the app if it's already running to run the new version correctly
- install app if not installed on run button press 
- reinstall apps on first run after upgrade/downgrade/remote+install (fix #308)