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/AdminHostsController.cs

@@ -0,0 +1,30 @@
+using FSO.Server.Api.Core.Utils;
+using System.Net;
+using System.Linq;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Cors;
+
+namespace FSO.Server.Api.Core.Controllers.Admin
+{
+    [EnableCors("AdminAppPolicy")]
+    [Route("admin/hosts")]
+    [ApiController]
+    public class AdminHostsController : ControllerBase
+    {
+        public IActionResult Get()
+        {
+            var api = Api.INSTANCE;
+            api.DemandAdmin(Request);
+            var hosts = api.HostPool.GetAll();
+
+            return ApiResponse.Json(HttpStatusCode.OK, hosts.Select(x => new {
+                role = x.Role,
+                call_sign = x.CallSign,
+                internal_host = x.InternalHost,
+                public_host = x.PublicHost,
+                connected = x.Connected,
+                time_boot = x.BootTime
+            }));
+        }
+    }
+}