Implemented Save and Load functionality

scripts/CSharp/GameEntity/Entities/Entity.cs

@@ -14,13 +14,13 @@ public class Entity
         id = new Random().NextInt64();
     }
 
-    protected virtual void SaveEntity(JObject json)
+    public virtual void SaveEntity(JObject json)
     {
         json["id"] = id;
         json["type"] = EntityType;
     }
 
-    protected virtual void LoadEntity(JObject json)
+    public virtual void LoadEntity(JObject json)
     {
         id = json.GetLongValue("id");
     }

scripts/CSharp/GameEntity/Entities/LoadedScenesEntity.cs

@@ -1,13 +1,32 @@
+using System;
 using System.Collections.Generic;
+using System.Linq;
+using System.Transactions;
+using Newtonsoft.Json.Linq;
 
 namespace Babushka.scripts.CSharp.GameEntity.Entities;
 
 public class LoadedScenesEntity : Entity
 {
     private HashSet<string> _loadedScenes = new();
-    public override string EntityType => "LoadedScenesEntity";
+    public override string EntityType => OWN_TYPE_NAME;
+    public const string OWN_TYPE_NAME = "LoadedScenesEntity";
     
     public void AddScene(string sceneName) => _loadedScenes.Add(sceneName);
     
     public bool WasSceneLoaded(string sceneName) => _loadedScenes.Contains(sceneName);
+
+    public override void SaveEntity(JObject json)
+    {
+        base.SaveEntity(json);
+        json["scenes"] = new JArray(_loadedScenes);
+    }
+
+    public override void LoadEntity(JObject json)
+    {
+        base.LoadEntity(json);
+        JArray array = (JArray?) json["scenes"] ?? throw new Exception("No scenes found in LoadedScenesEntity.");
+        
+        _loadedScenes = array.ToObject<HashSet<string>>()!;
+    }
 }

scripts/CSharp/GameEntity/Entities/PositionalEntity.cs

@@ -6,22 +6,21 @@ namespace Babushka.scripts.CSharp.GameEntity.Entities;
 
 public abstract class PositionalEntity : Entity
 {
-    private Node2D _positionalNodeRef;
     public Vector2 position;
     public string sceneName = "none";
 
-    protected override void SaveEntity(JObject json)
+    public override void SaveEntity(JObject json)
     {
         base.SaveEntity(json);
-        json["posx"] = _positionalNodeRef.Position.X;
-        json["posy"] = _positionalNodeRef.Position.Y;
+        json["posx"] = position.X;
+        json["posy"] = position.Y;
         json["scene"] = sceneName;
     }
 
-    protected override void LoadEntity(JObject json)
+    public override void LoadEntity(JObject json)
     {
         base.LoadEntity(json);
-        _positionalNodeRef.Position = new Vector2(
+        position = new Vector2(
             json.GetFloatValue("posx"),
             json.GetFloatValue("posy"));
         sceneName = json.GetStringValue("scene");