First round of cleanup for DolphinLib additions

SabreTools.Data.Models/NintendoDisc/FileSystemTable.cs

@@ -0,0 +1,26 @@
+namespace SabreTools.Data.Models.NintendoDisc
+{
+    public class FileSystemTable
+    {
+        /// <summary>
+        /// 8 bytes of unknown data
+        /// </summary>
+        /// <remarks>
+        /// Maps to <see cref="FileSystemTableEntry.NameOffset"/> and
+        /// <see cref="FileSystemTableEntry.FileOffset"/> but is unused?
+        /// </remarks>
+        public byte[] Unknown { get; set; } = new byte[8];
+
+        /// <summary>
+        /// Number of entries in the table
+        /// </summary>
+        /// <remarks>Big-endian</remarks>
+        public uint EntryCount { get; set; }
+
+        /// <summary>
+        /// File system table entries
+        /// </summary>
+        /// <remarks>Length given by <see cref="EntryCount"/></remarks>
+        public FileSystemTableEntry[] Entries { get; set; } = [];
+    }
+}