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.Database/DA/DbEvents/DbEvent.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace FSO.Server.Database.DA.DbEvents
+{
+    public class DbEvent
+    {
+        public int event_id { get; set; }
+        public string title { get; set; }
+        public string description { get; set; }
+        public DateTime start_day { get; set; }
+        public DateTime end_day { get; set; }
+        public DbEventType type { get; set; }
+        public int value { get; set; }
+        public int value2 { get; set; }
+        public string mail_subject { get; set; }
+        public string mail_message { get; set; }
+        public int? mail_sender { get; set; }
+        public string mail_sender_name { get; set; }
+
+        public string type_str {
+            get {
+                return type.ToString();
+            }
+        }
+    }
+
+    public class DbEventParticipation
+    {
+        public int event_id { get; set; }
+        public uint user_id { get; set; }
+    }
+
+    public enum DbEventType
+    {
+        mail_only,
+        free_object,
+        free_money,
+        free_green,
+        obj_tuning
+    }
+}