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/Controllers/Admin/AdminShardsController.cs

@@ -0,0 +1,69 @@
+using FSO.Server.Api.Core.Utils;
+using FSO.Server.Common;
+using Microsoft.AspNetCore.Cors;
+using Microsoft.AspNetCore.Mvc;
+using System.Net;
+
+namespace FSO.Server.Api.Core.Controllers.Admin
+{
+    [EnableCors("AdminAppPolicy")]
+    [Route("admin/shards")]
+    [ApiController]
+    public class AdminShardsController : ControllerBase
+    {
+        [HttpGet]
+        public IActionResult Get()
+        {
+            var api = Api.INSTANCE;
+            api.DemandAdmin(Request);
+
+            using (var db = api.DAFactory.Get())
+            {
+                var shards = db.Shards.All();
+                return ApiResponse.Json(HttpStatusCode.OK, shards);
+            }
+        }
+
+        [HttpPost("shutdown")]
+        public IActionResult shutdown(ShutdownModel sd)
+        {
+            var api = Api.INSTANCE;
+            api.DemandAdmin(Request);
+
+            ShutdownType type = ShutdownType.SHUTDOWN;
+            if (sd.update) type = ShutdownType.UPDATE;
+            else if (sd.restart) type = ShutdownType.RESTART;
+
+            api.RequestShutdown((uint)sd.timeout, type);
+
+            return ApiResponse.Json(HttpStatusCode.OK, true);
+        }
+
+        [HttpPost("announce")]
+        public IActionResult announce(AnnouncementModel an)
+        {
+            var api = Api.INSTANCE;
+            api.DemandModerator(Request);
+
+            api.BroadcastMessage(an.sender, an.subject, an.message);
+
+            return ApiResponse.Json(HttpStatusCode.OK, true);
+        }
+    }
+
+    public class AnnouncementModel
+    {
+        public string sender;
+        public string subject;
+        public string message;
+        public int[] shard_ids;
+    }
+
+    public class ShutdownModel
+    {
+        public int timeout;
+        public bool restart;
+        public bool update;
+        public int[] shard_ids;
+    }
+}