Add Spoon Installer models and notes

SabreTools.Serialization/Models/SpoonInstaller/FileEntry.cs

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+namespace SabreTools.Data.Models.SpoonInstaller
+{
+    /// <summary>
+    /// Single entry in the file table
+    /// </summary>
+    /// <remarks>Entry data is BZ2-compressed</remarks>
+    public class FileEntry
+    {
+        /// <summary>
+        /// File offset relative to the start of the file
+        /// </summary>
+        public uint FileOffset { get; set; }
+
+        /// <summary>
+        /// Compressed size of the entry
+        /// </summary>
+        /// <remarks>Includes headers</remarks>
+        public uint CompressedSize { get; set; }
+
+        /// <summary>
+        /// Uncompressed size of the entry
+        /// </summary>
+        public uint UncompressedSize { get; set; }
+
+        /// <summary>
+        /// CRC-32(?)
+        /// </summary>
+        public uint Crc32 { get; set; }
+
+        /// <summary>
+        /// Length of <see cref="Filename"/> 
+        /// </summary>
+        public byte FilenameLength { get; set; }
+
+        /// <summary>
+        /// ASCII filename
+        /// </summary>
+        public string? Filename { get; set; }
+    }
+}

SabreTools.Serialization/Models/SpoonInstaller/Footer.cs

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+namespace SabreTools.Data.Models.SpoonInstaller
+{
+    /// <summary>
+    /// Structure similar to the end of central directory
+    /// header in PKZIP files
+    /// </summary>
+    public class Footer
+    {
+        /// <summary>
+        /// Unknown
+        /// </summary>
+        /// <remarks>
+        /// Observed values:
+        /// - 81 83 DA 2F
+        /// </remarks>
+        public uint Unknown0 { get; set; }
+
+        /// <summary>
+        /// Unknown
+        /// </summary>
+        /// <remarks>
+        /// Observed values:
+        /// - 6A 00 00 00
+        /// </remarks>
+        public uint Unknown1 { get; set; }
+
+        /// <summary>
+        /// Offset of the start of the file table
+        /// </summary>
+        public uint TablePointer { get; set; }
+
+        /// <summary>
+        /// Number of entries that preceed the footer
+        /// </summary>
+        public uint EntryCount { get; set; }
+
+        /// <summary>
+        /// Unknown
+        /// </summary>
+        /// <remarks>
+        /// Observed values:
+        /// - 83 52 34 03
+        /// </remarks>
+        public uint Unknown2 { get; set; }
+
+        /// <summary>
+        /// Unknown, signature?
+        /// </summary>
+        /// <remarks>
+        /// Observed values:
+        /// - 43 F3 FF 0E
+        /// </remarks>
+        public uint Unknown3 { get; set; }
+    }
+}

SabreTools.Serialization/Models/SpoonInstaller/SFX.cs

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+namespace SabreTools.Data.Models.SpoonInstaller
+{
+    /// <summary>
+    /// Represents the structure at the end of a Spoon Installer
+    /// SFX file. These SFX files store all files bz2-compressed
+    /// sequentially in the overlay of an executable.
+    /// 
+    /// The design is similar to the end of central directory
+    /// in a PKZIP file. The footer needs to be read before
+    /// the entry table as both the pointer to the start of
+    /// the table as well as the entry count are included there.
+    /// 
+    /// The layout of this is derived from the layout in the
+    /// physical file.
+    /// </summary>
+    public class SFX
+    {
+        /// <summary>
+        /// Set of file entries
+        /// </summary>
+        public FileEntry[]? Entries { get; set; }
+
+        /// <summary>
+        /// Footer representing the central directory
+        /// </summary>
+        public Footer? Footer { get; set; }
+    }
+}