Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/tso.common/Content/ContentID.cs

@@ -0,0 +1,43 @@
+namespace FSO.Common.Content
+{
+    /// <summary>
+    /// Represents the ID of a content resource.
+    /// Consists of two parts: TypeID (uint) and FileID (uint).
+    /// </summary>
+    public class ContentID
+    {
+        public uint TypeID;
+        public uint FileID;
+        public string FileName;
+        private long v;
+
+
+        /// <summary>
+        /// Creates a new ContentID instance.
+        /// </summary>
+        /// <param name="typeID">The TypeID of the content resource.</param>
+        /// <param name="fileID">The FileID of the content resource.</param>
+        public ContentID(uint typeID, uint fileID)
+        {
+            this.TypeID = typeID;
+            this.FileID = fileID;
+        }
+
+        public ContentID(string name)
+        {
+            this.FileName = name;
+        }
+
+        public ContentID(long v)
+        {
+            this.TypeID = (uint)v;
+            this.FileID = (uint)(v >> 32);
+        }
+
+        public ulong Shift()
+        {
+            var fileIDLong = ((ulong)FileID) << 32;
+            return fileIDLong | TypeID;
+        }
+    }
+}