Add About page to the settings window #103
As per #98
I moved the
Checking for updatesAs a consequence I moved the check for updates to `App.xaml.cs` which may have some unwanted consequences: 1) not checked for updates if the main/terminal window is not opened at startup, and 2) now checks for updates whenever a new main/terminal window (or tab?) is opened. However, I think it is possible to revert this change
NotificationServiceI'm not sure how C# handles this, but note that the `NotificationService` is in both `App.xaml.cs` and `Program.cs`, I'm not sure what consequences this has...
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