move puzzle implementations out of engine

Assets/Engine/Runtime/UI/PauseButton.cs

@@ -1,22 +0,0 @@
-using NaughtyAttributes;
-using UnityEngine;
-using UnityEngine.UI;
-
-namespace EscapeRoomEngine.Engine.Runtime.UI
-{
-    /// <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;
-        }
-    }
-}