[Feature] Open the app the notification came from in the notification history

[XythedMC]

As the title mentions, a button that when clicked opens the app the notification was sent from, also could be launched by just clicking the notification in the notification history. For example, when the user gets a notification from ElecWhat (Whatsapp client), he could press a button that will appear when hovering over the notification, and will be sent to the ElecWhat application.

[Axenide]

It's not that I didn't want to add this, but I couldn't. I have to rework the notification system for this, but it will come eventually.