Added FSO.Files for use with the API server

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

server/tso.files/FAR3/Far3Entry.cs

@@ -0,0 +1,32 @@
+namespace FSO.Files.FAR3
+{
+    /// <summary>
+    /// Represents an entry in a FAR3 archive.
+    /// </summary>
+    public class Far3Entry
+    {
+        //A 4-byte unsigned integer specifying the uncompressed size of the file.
+        public uint DecompressedFileSize;
+        // A 3-byte unsigned integer specifying the compressed size of the file (including 
+        //the Persist header); if the data is raw, this field is ignored (though TSO's game 
+        //files have this set to the same first three bytes as the previous field).
+        public uint CompressedFileSize;
+        //Data type - A single byte used to describe what type of data is pointed to by the Data offset field. 
+        //The value can be 0x80 to denote that the data is a Persist container or 0x00 to denote that it is raw data.
+        public byte DataType;
+        //A 4-byte unsigned integer specifying the offset of the file from the beginning of the archive.
+        public uint DataOffset;
+        //A byte (can be either 0 or 1) specifying if this file is compressed.
+        public byte IsCompressed;
+        //A byte specifying the number of files this time has been accessed?
+        public byte AccessNumber;
+        //A 2-byte unsigned integer specifying the length of the filename field.
+        public ushort FilenameLength;
+        //A 4-byte integer describing what type of file is held.
+        public uint TypeID;
+        //A 4-byte ID assigned to the file which, together with the Type ID, is assumed to be unique all throughout the game.
+        public uint FileID;
+        //The name of the archived file; size depends on the filename length field.
+        public string Filename;
+    }
+}