Added Event Pipeline System

Firebird2D.EventPipelines/I_Pipeline.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Firebird2D.EventPipelines
+{
+    public interface I_Pipeline
+    {
+        object PipelineMaster { get; }
+        bool IsEventEmpty { get; }
+        void Subscribe(Delegate handler);
+        void Unsubscribe(Delegate handler);
+
+    }
+}