imp - Updated mod template for N.K.Extensions

---

We've changed the using clause to Nitrocid.Kernel.Extensions for the IMod
interface implementation.

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Type: imp
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

public/Nitrocid.Templates/templates/KSMod/ModName.cs

@@ -1,4 +1,4 @@
-using Nitrocid.Modifications;
+using Nitrocid.Kernel.Extensions;
 using System;
 using System.Collections.ObjectModel;
 using System.Reflection;
@@ -27,4 +27,4 @@ public void StopMod()
     }
 }
 
-// Refer to https://aptivi.github.io/Kernel-Simulator for up-to-date API documentation for mod developers.
+// Refer to https://aptivi.github.io/Nitrocid for up-to-date API documentation for mod developers.