Added defualt graph properties inspector;

Added sticky note;

Changed the name of BaseNode to SlotContainerNode in case we need other type of nodes in the future;

Sample/Runtime/Models/Nodes/BaseClasses/BackTraceNode.cs

@@ -0,0 +1,16 @@
+namespace Misaki.GraphView.Sample
+{
+    public abstract class BackTraceNode : SlotContainerNode
+    {
+        protected override void OnPullData(Slot input)
+        {
+            if (input.LinkedSlotData.Count == 0)
+            {
+                return;
+            }
+            
+            var outputNode = GraphObject.GetNode(input.LinkedSlotData[0].nodeID);
+            outputNode.Execute();
+        }
+    }
+}

Sample/Runtime/Models/Nodes/BaseClasses/BackTraceNode.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a761276bd0f3a4a4cb4b0894d193f4cd