Improve kernel events implementation (#430)

* Improve kernel events implementation

* Some cleanup

* Address PR feedback

Ryujinx.HLE/HOS/Kernel/KHandleEntry.cs

@@ -0,0 +1,17 @@
+namespace Ryujinx.HLE.HOS.Kernel
+{
+    class KHandleEntry
+    {
+        public KHandleEntry Next { get; set; }
+
+        public int Index { get; private set; }
+
+        public ushort HandleId { get; set; }
+        public object Obj      { get; set; }
+
+        public KHandleEntry(int Index)
+        {
+            this.Index = Index;
+        }
+    }
+}