Add GCZ, Nintendo disc, and WIA models

Code originally by https://github.com/Dimensional and split off from https://github.com/SabreTools/SabreTools.Serialization/pull/85/

SabreTools.Data.Models/NintendoDisc/DiscHeader.cs

@@ -0,0 +1,81 @@
+namespace SabreTools.Data.Models.NintendoDisc
+{
+    /// <summary>
+    /// GameCube / Wii disc boot block header (first 0x440 bytes of the disc)
+    /// </summary>
+    /// <see href="https://wiibrew.org/wiki/Wii_disc"/>
+    public sealed class DiscHeader
+    {
+        /// <summary>
+        /// 6-character ASCII game ID (e.g. "GALE01")
+        /// </summary>
+        /// <remarks>6 bytes at offset 0x000</remarks>
+        public string GameId { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 2-character ASCII maker / publisher code (e.g. "01")
+        /// </summary>
+        /// <remarks>Derived from GameId bytes at offset 0x004–0x005; not a separate on-disc field</remarks>
+        public string MakerCode { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Zero-based disc number for multi-disc games
+        /// </summary>
+        public byte DiscNumber { get; set; }
+
+        /// <summary>
+        /// Disc version
+        /// </summary>
+        public byte DiscVersion { get; set; }
+
+        /// <summary>
+        /// Non-zero if audio streaming is enabled
+        /// </summary>
+        public byte AudioStreaming { get; set; }
+
+        /// <summary>
+        /// Audio streaming buffer size (in 16 KiB units)
+        /// </summary>
+        public byte StreamingBufferSize { get; set; }
+
+        /// <summary>
+        /// Wii magic word at offset 0x018 (0x5D1C9EA3 for Wii discs, 0 for GameCube)
+        /// </summary>
+        public uint WiiMagic { get; set; }
+
+        /// <summary>
+        /// GameCube magic word at offset 0x01C (0xC2339F3D for GameCube discs)
+        /// </summary>
+        public uint GCMagic { get; set; }
+
+        /// <summary>
+        /// Null-terminated ASCII game title (up to 0x60 bytes at offset 0x020)
+        /// </summary>
+        public string GameTitle { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Non-zero to disable hash verification (GameCube only)
+        /// </summary>
+        public byte DisableHashVerification { get; set; }
+
+        /// <summary>
+        /// Non-zero to disable disc encryption (GameCube only)
+        /// </summary>
+        public byte DisableDiscEncryption { get; set; }
+
+        /// <summary>
+        /// Offset of the main DOL executable (no shift for GameCube; &lt;&lt;2 for Wii)
+        /// </summary>
+        public uint DolOffset { get; set; }
+
+        /// <summary>
+        /// Offset of the File System Table (no shift for GameCube; &lt;&lt;2 for Wii)
+        /// </summary>
+        public uint FstOffset { get; set; }
+
+        /// <summary>
+        /// Maximum size of the File System Table in bytes
+        /// </summary>
+        public uint FstSize { get; set; }
+    }
+}