Updating - Fix crash when client has internet

Updating - Check for updates periodically and when window opens (if auto-update enabled)
Webserver - Don't write wildcard to webserver.txt

src/Artemis.Core/Services/Core/BuildInfo.cs

@@ -38,5 +38,10 @@ namespace Artemis.Core.Services.Core
         /// </summary>
         [JsonProperty]
         public string SourceVersion { get; internal set; } = null!;
+
+        /// <summary>
+        /// Gets a boolean indicating whether the current build is a local build
+        /// </summary>
+        public bool IsLocalBuild { get; internal set; }
     }
 }

src/Artemis.Core/Services/WebServer/WebServerService.cs

@@ -61,7 +61,7 @@ namespace Artemis.Core.Services
             server.StateChanged += (s, e) => _logger.Verbose("WebServer new state - {state}", e.NewState);
 
             // Store the URL in a webserver.txt file so that remote applications can find it
-            File.WriteAllText(Path.Combine(Constants.DataFolder, "webserver.txt"), url);
+            File.WriteAllText(Path.Combine(Constants.DataFolder, "webserver.txt"), $"http://localhost:{_webServerPortSetting.Value}/");
 
             return server;
         }