Added FSO.Files for use with the API server

Don't ask me. FreeSO is the prime example of dependency hell.

server/tso.files/Formats/IFF/Chunks/FSOM.cs

@@ -0,0 +1,57 @@
+using FSO.Files.RC;
+using Microsoft.Xna.Framework.Graphics;
+using System.IO;
+using System.IO.Compression;
+
+namespace FSO.Files.Formats.IFF.Chunks
+{
+    /// <summary>
+    /// Iff chunk wrapper for an FSOM file. 
+    /// </summary>
+    public class FSOM : IffChunk
+    {
+        private byte[] data;
+        private DGRP3DMesh Cached;
+
+        /// <summary>
+        /// Reads a BMP chunk from a stream.
+        /// </summary>
+        /// <param name="iff">An Iff instance.</param>
+        /// <param name="stream">A Stream object holding a BMP chunk.</param>
+        public override void Read(IffFile iff, Stream stream)
+        {
+            data = new byte[stream.Length];
+            stream.Read(data, 0, (int)stream.Length);
+        }
+
+        public override bool Write(IffFile iff, Stream stream)
+        {
+            if (data == null)
+            {
+                using (var cstream = new GZipStream(stream, CompressionMode.Compress))
+                    Cached.Save(cstream);
+            } else
+            {
+                stream.Write(data, 0, data.Length);
+            }
+            return true;
+        }
+
+        public DGRP3DMesh Get(DGRP dgrp, GraphicsDevice device)
+        {
+            if (Cached == null) {
+                using (var stream = new MemoryStream(data)) {
+                    Cached = new DGRP3DMesh(dgrp, stream, device);
+                }
+            }
+            data = null;
+            return Cached;
+        }
+
+        public void SetMesh(DGRP3DMesh mesh)
+        {
+            Cached = mesh;
+            data = null;
+        }
+    }
+}