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/ClientEpoch.cs

@@ -0,0 +1,50 @@
+using System;
+
+namespace FSO.Common
+{
+    /// <summary>
+    /// TODO: apply a time delta to sync with server time. right now we assume client time is correct.
+    /// </summary>
+    public class ClientEpoch
+    {
+        public static uint Now
+        {
+            get
+            {
+                uint epoch = (uint)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds;
+                return epoch;
+            }
+        }
+
+        public static uint FromDate(DateTime time)
+        {
+            return (uint)(time.ToUniversalTime() - new DateTime(1970, 1, 1)).TotalSeconds;
+        }
+
+        public static DateTime ToDate(uint time)
+        {
+            var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            return epoch.AddSeconds(time);
+        }
+
+        public static string HMSRemaining(uint date)
+        {
+            TimeSpan span = (ToDate(date) - ToDate(ClientEpoch.Now));
+
+            return String.Format("{0} hours, {1} minutes and {2} seconds", (int)span.TotalHours, span.Minutes, span.Seconds);
+        }
+
+        public static string DHMRemaining(uint date)
+        {
+            if (date == uint.MaxValue) return "Permanent";
+            TimeSpan span = (ToDate(date) - ToDate(ClientEpoch.Now));
+
+            return String.Format("{0} days, {1} hours and {2} minutes", (int)span.TotalDays, span.Hours, span.Minutes);
+        }
+
+        public static uint Default
+        {
+            get { return 0; }
+        }
+    }
+}