Add splashscreen

[Lamparter]

Description

Makes splashscreen not optional

Related Issues

https://discord.com/channels/714581497222398064/1273778948903403520/1273778948903403520

Changes Made

• Added uap5 xml schematics to manifest
• Stated that the splash screen is not optional

Checklist

• [ ] I have tested these changes thoroughly.
• [x] I have reviewed my code for any potential errors or issues.
• [ ] I have followed the code style guidelines for this project.

Additional Notes

All of these code changes completed on my phone! 😄

Code of Conduct

By submitting this issue, I agree to follow the Code of Conduct.

[Lamparter]

@RyanLua please use the squash and merge feature because I would like to get credit for this pr

[RyanLua]

I took a look and tried to test it myself, but it still shows black before the UI loads?

[Lamparter]

I took a look and tried to test it myself, but it still shows black before the UI loads?

I may have mistyped something - @RyanLua I'm on holiday right now when I get back I'll take a closer look

[RyanLua]

@Lamparter Are you still working on this or can I close this stale PR?

[Lamparter]

Yeah I don't think I really understand how to add the splashscreen; it's strange because this line of code usually adds it. Perhaps that's only on UWP apps 😅

[Lamparter]

This might work:

protected override void OnLaunched(LaunchActivatedEventArgs args)
{
    base.OnLaunched(args);

    Frame rootFrame = Window.Current.Content as Frame;

    if (rootFrame == null)
    {
        rootFrame = new Frame();
        rootFrame.NavigationFailed += OnNavigationFailed;
        Window.Current.Content = rootFrame;
    }

    if (rootFrame.Content == null)
    {
        rootFrame.Navigate(typeof(MainPage), args.Arguments);
    }

    Window.Current.Activate();
}

That's how I have it in some apps. I'll take a look later.