Move tray app to .NET 4.7.2

[anthonylavado]

This adds x64 Server 2019 support, for those who had issues.

We'll revisit a hybrid approach when we start building installer and tray for ARM.

Fixes #125 #119

[crobibero]

Does CI/nsis need to be updated for the subpath support?

[nielsvanvelzen]

Doesn't the tray app try to find jellyfin.exe it its own directory (CWD)? That would obviously fail after this PR.

[anthonylavado]

Does CI/nsis need to be updated for the subpath support?

NSIS does have paths for the tray app to make shortcuts, those are updated for the sub folder in here.

The CI has the same subfolder specified for the output which should mean it's okay.

[anthonylavado]

Doesn't the tray app try to find jellyfin.exe it its own directory (CWD)? That would obviously fail after this PR.

Good catch, I'll update that.

[anthonylavado]

@nielsvanvelzen Looks like we already covered that case a long time ago:

jellyfin-server-windows/Jellyfin.Windows.Tray/TrayApplicationContext.cs

Line 159 in 6fd2959

_executableFile = Path.Combine(_installFolder, "jellyfin.exe");

IIRC the tray app used to be in its own folder, a long time ago 🙂

[anthonylavado]

I just realized that windows-latest has a 4.7.2 targeting pack, but doesn't list it in .NET Core Tools (see here). Should I kick this back to 2019?