Send watchdog events in a better fashion

src/DMAPI/tgs/v4/api.dm

@@ -141,7 +141,15 @@
 			return result
 		if(TGS4_TOPIC_EVENT)
 			intercepted_message_queue = list()
-			event_handler.HandleEvent(text2num(params[TGS4_PARAMETER_DATA]))
+			var/list/event_notification = json_decode(params[TGS4_PARAMETER_DATA])
+			var/list/event_parameters = event_notification["Parameters"]
+
+			var/list/event_call = list(event_notification["Type"])
+			if(event_parameters)
+				event_call += event_parameters
+
+			event_handler.HandleEvent(arglist(event_call))
+
 			. = json_encode(intercepted_message_queue)
 			intercepted_message_queue = null
 			return

src/Tgstation.Server.Host/Components/Interop/EventNotification.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+
+namespace Tgstation.Server.Host.Components.Interop
+{
+	/// <summary>
+	/// For notifying DD of <see cref="EventType"/>s
+	/// </summary>
+	sealed class EventNotification
+	{
+		/// <summary>
+		/// The <see cref="EventType"/>
+		/// </summary>
+		public EventType Type { get; set; }
+
+		/// <summary>
+		/// The event parameters
+		/// </summary>
+		public IEnumerable<string> Parameters { get; set; }
+	}
+}

src/Tgstation.Server.Host/Components/Watchdog/Watchdog.cs

@@ -801,12 +801,14 @@ namespace Tgstation.Server.Host.Components.Watchdog
 					return true;
 
 				var builder = new StringBuilder(Constants.DMTopicEvent);
-				if (parameters != null)
-					foreach (var I in parameters)
-					{
-						builder.Append("&");
-						builder.Append(byondTopicSender.SanitizeString(I));
-					}
+				builder.Append("&");
+				var notification = new EventNotification
+				{
+					Type = eventType,
+					Parameters = parameters
+				};
+				var json = JsonConvert.SerializeObject(notification);
+				builder.Append(byondTopicSender.SanitizeString(json));
 
 				var activeServer = AlphaIsActive ? alphaServer : bravoServer;
 				results = await activeServer.SendCommand(builder.ToString(), cancellationToken).ConfigureAwait(false);