Add package name to notification

[saizai]

Some packages nicely label their notifications with the package name so you know what generated it. Unfortunately, many don't.

Please change notifications to always add the generating package's name, e.g. perhaps in the top right corner of the notification (in its title bar area).

Bonus points:

1. don't do this for notifications that have the package name in the notification title already
2. make this a setting (default on)
3. allow user to whitelist packages to have anonymous notifications