feat(graph nodes): nested graph playback now available

Add a nested graph reference and it will play until complete. Then automatically return to the
parent graph that played it by running the out connection (if any)

Author: ashblue

Assembly-CSharp.csproj.meta

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   dialogue: Not great. We only have enough resources to provide relief for one group.
     Can't save them all.
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   dialogue: All the supplies are gone. Destroyed by the attack on the sea.
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   dialogue: My people have suffered more than any other in this war. Please see that
     the elves are taken care of first.
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+  dialogue: Sorry about that. How are things going again?
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Assets/Examples/BasicConversation/ExampleConversation.asset

@@ -6,7 +6,7 @@ namespace CleverCrow.Fluid.Dialogues.Examples {
     [CreateMenu("Example/Condition")]
     public class ExampleCondition : ConditionDataBase {
         [SerializeField]
-        private bool _isValid;
+        private bool _isValid = false;
 
         public override bool OnGetIsValid (INode parent) {
             Debug.Log($"Example Condition: Returned {_isValid} for node {parent.UniqueId}");

Assets/Examples/BasicConversation/ExampleNestedDialogue.asset

@@ -0,0 +1,17 @@
+using CleverCrow.Fluid.Dialogues.Nodes;
+using UnityEditor;
+using UnityEngine;
+
+namespace CleverCrow.Fluid.Dialogues.Editors.NodeDisplays {
+    [NodeType(typeof(NodePlayGraphData))]
+    public class PlayGraphEditor : NodeEditorBase {
+        protected override Color NodeColor { get; } = new Color(0.75f, 0.52f, 0f);
+        protected override float NodeWidth { get; } = 200;
+
+        protected override void OnPrintBody (Event e) {
+            serializedObject.Update();
+            EditorGUILayout.PropertyField(serializedObject.FindProperty("dialogueGraph"), GUIContent.none);
+            serializedObject.ApplyModifiedProperties();
+        }
+    }
+}

Assets/Examples/BasicConversation/ExampleNestedDialogue.asset.meta

@@ -3,9 +3,12 @@
 using CleverCrow.Fluid.Dialogues.Nodes.PlayGraph;
 
 namespace CleverCrow.Fluid.Dialogues.Nodes {
+    [CreateMenu("Play Graph")]
     public class NodePlayGraphData : NodeDataBase {
         public DialogueGraph dialogueGraph;
 
+        protected override string DefaultName => "Play Graph";
+
         public override INode GetRuntime (IGraph graphRuntime, IDialogueController dialogue) {
             return new NodePlayGraph(
                 graphRuntime,

Assets/Examples/ExampleCondition.cs

@@ -19,7 +19,7 @@
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