replace v6 with experimental v7 code

src/MpvNet/Folder.cs

@@ -0,0 +1,10 @@
+
+using MpvNet.ExtensionMethod;
+
+namespace MpvNet;
+
+public class Folder
+{
+    public static string Startup { get; } = Path.GetDirectoryName(Environment.ProcessPath)!.AddSep();
+    public static string AppData { get; } = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).AddSep();
+}