replace v6 with experimental v7 code

src/MpvNet/AppInfo.cs

@@ -0,0 +1,11 @@
+
+using System.Reflection;
+
+namespace MpvNet;
+
+public static class AppInfo
+{
+    public static string Product => GetAssemblyAttribute<AssemblyProductAttribute>().Product;
+    public static Version Version => Assembly.GetEntryAssembly()!.GetName().Version!;
+    static T GetAssemblyAttribute<T>() => (T)(object)Assembly.GetEntryAssembly()!.GetCustomAttributes(typeof(T)).First();
+}