Gallery Menu initial implementation

Zennysoft.Game.Ma/src/options/GalleryData.cs

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+using Chickensoft.Introspection;
+using Chickensoft.Serialization;
+using Godot;
+
+namespace Zennysoft.Game.Ma;
+
+[Meta, Id("gallery_data")]
+public partial class GalleryData : Node
+{
+  [Save("PlaceholderImage1")]
+  public required bool PlaceholderImage1 { get; set; }
+}

Zennysoft.Game.Ma/src/options/GalleryData.cs.uid

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+uid://cy2vuwwvm727f