Notification Improvements

• This update adds support for notification grouping (depending on what app is sending notifications) and notification images so you can easily see what app is sending messages, there are two options for grouping app, and nzbid.
• Updated server settings and added a new button to access the full NZBGet UI.

New versions of the notification script have been released as well as custom scripts for your favourite arr apps, API documentation has been updated as well, please let me know if there is a missing app you would like added.