[Puzzles] Add basic framework for ScriptableObject puzzle steps and puzzle solving.

Assets/Scripts/DebugUIMessage.cs

@@ -0,0 +1,62 @@
+using UnityEngine;
+using UnityEngine.UI;
+using System.Collections;
+
+public class DebugUIMessage : MonoBehaviour
+{
+    private static DebugUIMessage instance;
+    private Text messageText;
+    private Canvas canvas;
+    private Coroutine hideCoroutine;
+
+    public static void Show(string message, float duration = 2f)
+    {
+        if (instance == null)
+        {
+            var go = new GameObject("DebugUIMessage");
+            instance = go.AddComponent<DebugUIMessage>();
+            instance.SetupUI();
+            DontDestroyOnLoad(go);
+        }
+        instance.ShowMessage(message, duration);
+    }
+
+    private void SetupUI()
+    {
+        canvas = new GameObject("DebugUICanvas").AddComponent<Canvas>();
+        canvas.renderMode = RenderMode.ScreenSpaceOverlay;
+        canvas.sortingOrder = 9999;
+        canvas.gameObject.transform.SetParent(transform);
+        var textGO = new GameObject("DebugUIText");
+        textGO.transform.SetParent(canvas.transform);
+        messageText = textGO.AddComponent<Text>();
+        messageText.alignment = TextAnchor.MiddleCenter;
+        messageText.font = Resources.GetBuiltinResource<Font>("Arial.ttf");
+        messageText.fontSize = 32;
+        messageText.color = Color.yellow;
+        var rect = messageText.GetComponent<RectTransform>();
+        rect.anchorMin = new Vector2(0.5f, 0.1f);
+        rect.anchorMax = new Vector2(0.5f, 0.1f);
+        rect.pivot = new Vector2(0.5f, 0.5f);
+        rect.anchoredPosition = Vector2.zero;
+        rect.sizeDelta = new Vector2(800, 100);
+        messageText.text = "";
+    }
+
+    private void ShowMessage(string message, float duration)
+    {
+        messageText.text = message;
+        messageText.enabled = true;
+        if (hideCoroutine != null)
+            StopCoroutine(hideCoroutine);
+        hideCoroutine = StartCoroutine(HideAfterSeconds(duration));
+    }
+
+    private IEnumerator HideAfterSeconds(float seconds)
+    {
+        yield return new WaitForSeconds(seconds);
+        messageText.text = "";
+        messageText.enabled = false;
+    }
+}
+