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/FSO.Server.Common/ShutdownType.cs

@@ -0,0 +1,9 @@
+namespace FSO.Server.Common
+{
+    public enum ShutdownType : byte
+    {
+        SHUTDOWN = 0,
+        RESTART = 1,
+        UPDATE = 2 //restart but runs an update task
+    }
+}