move puzzle implementations out of engine

Assets/Engine/Runtime/UI/Elements/PauseButton.cs

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+using NaughtyAttributes;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace EscapeRoomEngine.Engine.Runtime.UI.Elements
+{
+    /// <summary>
+    /// This component is responsible to change the icon of the pause button depending on the game state.
+    /// </summary>
+    public class PauseButton : MonoBehaviour
+    {
+        [BoxGroup("Internal")] [SerializeField]
+        private Image icon;
+        [BoxGroup("Internal")] [SerializeField]
+        private Sprite pauseIcon, resumeIcon;
+
+        public bool Paused
+        {
+            set => icon.sprite = value ? resumeIcon : pauseIcon;
+        }
+    }
+}

Assets/Engine/Runtime/UI/Elements/PauseButton.cs.meta

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+fileFormatVersion: 2
+guid: 453c346d9a6f46828b7fc21944890efa
+timeCreated: 1671030945

Assets/Engine/Runtime/UI/Elements/PuzzlePlan.cs

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+using System.Collections.Generic;
+using EscapeRoomEngine.Engine.Runtime.Modules.Description;
+using NaughtyAttributes;
+using UnityEngine;
+
+namespace EscapeRoomEngine.Engine.Runtime.UI.Elements
+{
+    /// <summary>
+    /// The puzzle plan UI component that displays the current puzzle plan in the game master window.
+    /// </summary>
+    public class PuzzlePlan : MonoBehaviour
+    {
+        /// <summary>
+        /// The distance from one entry to the next.
+        /// </summary>
+        [SerializeField]
+        private Vector2 entryOffset;
+        [BoxGroup("Internal")] [SerializeField]
+        private RectTransform plan;
+        [BoxGroup("Internal")] [SerializeField]
+        private PuzzlePlanEntry currentPuzzle, entryPrefab;
+        [BoxGroup("Internal")] [SerializeField]
+        private GameObject currentPuzzleTitle, planTitle;
+
+        public PuzzleModuleDescription CurrentPuzzle
+        {
+            set
+            {
+                currentPuzzleTitle.SetActive(true);
+                currentPuzzle.gameObject.SetActive(true);
+                
+                // set the current puzzle
+                currentPuzzle.Puzzle = value;
+            }
+        }
+        public List<PuzzleModuleDescription> Puzzles
+        {
+            set
+            {
+                planTitle.SetActive(true);
+                plan.gameObject.SetActive(true);
+                
+                // remove the old children
+                foreach (RectTransform child in plan)
+                {
+                    Destroy(child.gameObject);
+                }
+                
+                // add the new children
+                var offset = Vector2.zero;
+                value.ForEach(puzzle =>
+                {
+                    var entry = Instantiate(entryPrefab, plan, false);
+                    entry.Position = offset;
+                    entry.Puzzle = puzzle;
+                    offset += entryOffset;
+                });
+            }
+        }
+    }
+}

Assets/Engine/Runtime/UI/Elements/PuzzlePlan.cs.meta

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+fileFormatVersion: 2
+guid: ad95894771b8478591e5f5abbe1d0244
+timeCreated: 1671133031

Assets/Engine/Runtime/UI/Elements/PuzzlePlanEntry.cs

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+using EscapeRoomEngine.Engine.Runtime.Measurements;
+using EscapeRoomEngine.Engine.Runtime.Modules.Description;
+using EscapeRoomEngine.Engine.Runtime.Utilities;
+using NaughtyAttributes;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace EscapeRoomEngine.Engine.Runtime.UI.Elements
+{
+    /// <summary>
+    /// An entry in the <see cref="PuzzlePlan"/> UI component that displays the name and estimated time for a puzzle.
+    /// </summary>
+    public class PuzzlePlanEntry : MonoBehaviour
+    {
+        [BoxGroup("Internal")] [Required] [SerializeField]
+        private Text puzzleName, estimatedTime;
+
+        public Vector2 Position
+        {
+            set
+            {
+                puzzleName.rectTransform.anchoredPosition = value;
+            }
+        }
+        public PuzzleModuleDescription Puzzle
+        {
+            set
+            {
+                puzzleName.text = value.puzzleName;
+                estimatedTime.text = $"Time Estimate: {Measure.EstimateTime(value).ToTimeSpan():mm':'ss}";
+            }
+        }
+    }
+}

Assets/Engine/Runtime/UI/Elements/PuzzlePlanEntry.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 8ef80fc9016c4a46a190769f3b771bfa
+timeCreated: 1671136597