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.Api.Core/Models/EventCreateModel.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+
+namespace FSO.Server.Api.Core.Models
+{
+    public class EventCreateModel
+    {
+        public string title;
+        public string description;
+        public DateTime start_day;
+        public DateTime end_day;
+        public string type;
+        public int value;
+        public int value2;
+        public string mail_subject;
+        public string mail_message;
+        public int mail_sender;
+        public string mail_sender_name;
+    }
+
+    public class PresetCreateModel
+    {
+        public string name;
+        public string description;
+        public int flags;
+        public List<PresetItemModel> items;
+    }
+
+    public class PresetItemModel
+    {
+        public string tuning_type;
+        public int tuning_table;
+        public int tuning_index;
+        public float value;
+    }
+}