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/WALm.cs

@@ -0,0 +1,61 @@
+using FSO.Files.Utils;
+using System.Collections.Generic;
+using System.IO;
+
+namespace FSO.Files.Formats.IFF.Chunks
+{
+    /// <summary>
+    /// WALm and FLRm chunks, used for mapping walls and floors in ARRY chunks to walls and floors in resource files (outwith floors.iff)
+    /// </summary>
+    public class WALm : IffChunk
+    {
+        public List<WALmEntry> Entries;
+
+        public override void Read(IffFile iff, Stream stream)
+        {
+            using (var io = IoBuffer.FromStream(stream, ByteOrder.LITTLE_ENDIAN))
+            {
+                var zero = io.ReadInt32();
+                var version = io.ReadInt32(); //should be 0
+                var walm = io.ReadInt32(); //mLAW/mRLF
+
+                var count = io.ReadInt32();
+                Entries = new List<WALmEntry>();
+
+                for (int i=0; i<count; i++)
+                {
+                    //size of fields depends on chunk id.
+                    Entries.Add(new WALmEntry(io, ChunkID));
+                }
+            }
+        }
+    }
+
+    public class FLRm : WALm
+    {
+        //literally no difference
+    }
+
+    public class WALmEntry
+    {
+        public string Name;
+        public int Unknown; //usually 1
+        public byte ID;
+        public byte[] Unknown2;
+        public WALmEntry(IoBuffer io, int id)
+        {
+            Name = io.ReadNullTerminatedString();
+            if (Name.Length % 2 == 0) io.ReadByte(); //pad to short width
+            Unknown = io.ReadInt32(); //index in iff?
+            ID = io.ReadByte();
+            Unknown2 = io.ReadBytes(5 + id * 2);
+
+            //id 0 seems to be an older format
+            //unknown2 is 01 00 00 00 00 00
+            //id 1 adds more fields
+            //unknown2 is 01 01 00 00 00 00 00 00
+
+            //related to number of walls or floors in the file?
+        }
+    }
+}