replace v6 with experimental v7 code

src/MpvNet/Help/FileHelp.cs

@@ -0,0 +1,20 @@
+
+namespace MpvNet.Help;
+
+public static class FileHelp
+{
+    public static void Delete(string path)
+    {
+        try
+        {
+            if (File.Exists(path))
+                File.Delete(path);
+        }
+        catch (Exception ex)
+        {
+            Terminal.WriteError("Failed to delete file:" + BR + path + BR + ex.Message);
+        }
+    }
+
+    public static string ReadTextFile(string path) => File.Exists(path) ? File.ReadAllText(path) : "";
+}