Add TimerExtensions

Extensions/Timer.cs

@@ -0,0 +1,12 @@
+using Godot;
+
+namespace SupaLidlGame.Extensions;
+
+public static class TimerExtensions
+{
+    public static void Restart(this Timer timer, double timeSec = -1)
+    {
+        timer.Stop();
+        timer.Start(timeSec);
+    }
+}