Changed Slot in RelayNode to ProxySlot;

Changed PullData and PushData from SlotExtension to ISlot;

Added BackTraceExecutableNode;

Removed IExecutable from RelayNode;

Runtime/Models/Slots/SlotData.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace Misaki.GraphView
+{
+    [Serializable]
+    public struct SlotData : IEquatable<SlotData>
+    {
+        public string slotName;
+        public string nodeID;
+        public int slotIndex;
+        public SlotDirection direction;
+        public string valueType;
+
+        public bool Equals(SlotData other)
+        {
+            return slotName == other.slotName && nodeID == other.nodeID && slotIndex == other.slotIndex && direction == other.direction && valueType == other.valueType;
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is SlotData other && Equals(other);
+        }
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(slotName, nodeID, slotIndex, direction, valueType);
+        }
+
+        public static bool operator ==(SlotData left, SlotData right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(SlotData left, SlotData right)
+        {
+            return !left.Equals(right);
+        }
+    }
+}