Fix memory leak when saving scene to file

Screenshot was not passed to MPSScene constructor so MPSscene handled
loading the thumbnail from the file system instead and the screenshot
was left in memory.

COM3D2.MeidoPhotoStudio.Plugin/MeidoPhotoStudio/Managers/SceneManager.cs

@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 using BepInEx.Configuration;
+using Object = UnityEngine.Object;
 
 namespace COM3D2.MeidoPhotoStudio.Plugin
 {
@@ -291,28 +292,39 @@ namespace COM3D2.MeidoPhotoStudio.Plugin
                 string fileName = $"{scenePrefix}{Utility.Timestamp}.png";
                 string savePath = Path.Combine(CurrentScenesDirectory, fileName);
 
-                if (overwrite && CurrentScene?.FileInfo != null) savePath = CurrentScene.FileInfo.FullName;
-                else overwrite = false;
+                Utility.ResizeToFit(screenshot, (int) sceneDimensions.x, (int) sceneDimensions.y);
 
-                Utility.ResizeToFit(screenshot, (int)sceneDimensions.x, (int)sceneDimensions.y);
-
-                using (FileStream fileStream = File.Create(savePath))
+                try
                 {
-                    byte[] encodedPng = screenshot.EncodeToPNG();
-                    fileStream.Write(encodedPng, 0, encodedPng.Length);
-                    fileStream.Write(sceneData, 0, sceneData.Length);
+                    if (overwrite && CurrentScene?.FileInfo != null) savePath = CurrentScene.FileInfo.FullName;
+                    else overwrite = false;
+
+                    using (FileStream fileStream = File.Create(savePath))
+                    {
+                        byte[] encodedPng = screenshot.EncodeToPNG();
+                        fileStream.Write(encodedPng, 0, encodedPng.Length);
+                        fileStream.Write(sceneData, 0, sceneData.Length);
+                    }
+
+                    if (overwrite)
+                    {
+                        File.SetCreationTime(savePath, CurrentScene.FileInfo.CreationTime);
+                        CurrentScene.Destroy();
+                        SceneList.RemoveAt(CurrentSceneIndex);
+                    }
                 }
-
-                if (overwrite)
+                catch (Exception e)
                 {
-                    File.SetCreationTime(savePath, CurrentScene.FileInfo.CreationTime);
-                    CurrentScene.Destroy();
-                    SceneList.RemoveAt(CurrentSceneIndex);
+                    Utility.LogError($"Failed to save scene to disk because {e.Message}\n{e.StackTrace}");
+                    Object.DestroyImmediate(screenshot);
+                    Busy = false;
+                    return;
                 }
 
-                SceneList.Add(new MPSScene(savePath));
+                SceneList.Add(new MPSScene(savePath, screenshot));
                 SortScenes(CurrentSortMode);
             }
+            else Object.DestroyImmediate(screenshot);
 
             Busy = false;
         }