move puzzle implementations out of engine

Assets/Engine/Runtime/Requirements/Precondition/RelatedModule.cs

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+using System.Collections.Generic;
+using EscapeRoomEngine.Engine.Runtime.Modules;
+using EscapeRoomEngine.Engine.Runtime.Modules.Description;
+using NaughtyAttributes;
+using UnityEngine;
+
+namespace EscapeRoomEngine.Engine.Runtime.Requirements.Precondition
+{
+    /// <summary>
+    /// This requirement guarantees that a module is placed in the same space as its related module.
+    /// </summary>
+    [CreateAssetMenu(menuName = "Requirements/Related Module")]
+    class RelatedModule : PreconditionRequirement
+    {
+        [InfoBox("A related module that must be added to the same space successfully before this module is added.")]
+        [Required]
+        public ModuleDescription relatedModule;
+        
+        protected override List<bool> FilterCandidates(List<bool> candidates, Module module, Space space)
+        {
+            var newModule = Module.CreateModuleByType(space, relatedModule);
+            module.relatedModules.Add(newModule);
+            
+            return new List<bool> { space.StageModuleWithRequirements(newModule) };
+        }
+    }
+}

Assets/Engine/Runtime/Requirements/Precondition/RelatedModule.cs.meta

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+fileFormatVersion: 2
+guid: 6e3f3bf07aae4a03834a7943c255f37d
+timeCreated: 1668947627