feat: implement AttractVideoPlayer (#2)

Service Button : Pause the attract video
L2/L3 Buttons : Previous/next to cycle through all the attract videos
Saving the selected video for future game launches

Co-authored-by: akanyan <alicechecker01@proton.me>
Reviewed-on: akanyan/mu3-mods#2
Co-authored-by: jujuforce <jujuforce@noreply.gitea.tendokyu.moe>
Co-committed-by: jujuforce <jujuforce@noreply.gitea.tendokyu.moe>

AttractVideoPlayer/MU3.OperationManager/patch_OperationManager.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.ObjectModel;
+using System.IO;
+
+namespace MU3.Operation;
+
+class patch_OperationManager: OperationManager {
+    private static readonly string _fname = "data_advert_cache.txt";
+    private ReadOnlyCollection<MovieData> _movieDataList;
+    private int _movieIndex;
+
+    ~patch_OperationManager() {
+        try {
+            File.WriteAllText(_fname, _movieIndex.ToString());
+        } catch(Exception) {}
+    }
+    public int MovieIndex {
+        set {
+            _movieIndex = (value + _movieDataList.Count) % _movieDataList.Count;
+        }
+        get {
+            return _movieIndex;
+        }
+    }
+    public new MovieData movieData {
+        get {
+            if(_movieDataList.Count > 0) {
+                return _movieDataList[_movieIndex];
+            }
+            return null;
+        }
+    }
+
+    public extern void orig_initialize();
+
+    public new void initialize() {
+        orig_initialize();
+        try {
+            _movieIndex = Math.Max(0, int.Parse(File.ReadAllText(_fname)));
+        } catch(Exception) {
+            _movieIndex = 0;
+        }
+
+    }
+}