replace v6 with experimental v7 code

src/MpvNet/Chapter.cs

@@ -0,0 +1,28 @@
+
+using MpvNet.ExtensionMethod;
+
+namespace MpvNet;
+
+public class Chapter
+{
+    public string Title { get; set; } = "";
+    public double Time { get; set; }
+
+    string? _timeDisplay;
+
+    public string TimeDisplay
+    {
+        get
+        {
+            if (_timeDisplay == null)
+            {
+                _timeDisplay = TimeSpan.FromSeconds(Time).ToString();
+
+                if (_timeDisplay.ContainsEx("."))
+                    _timeDisplay = _timeDisplay[.._timeDisplay.LastIndexOf(".")];
+            }
+
+            return _timeDisplay;
+        }
+    }
+}