Launch arguments feature (#30)

* Launch arguments feature

I wanted to delay round start only for the first server start but i found another bug in content... may as well commit this for anyone who needs it and when i fix it

* Review

SS14.Watchdog/Components/ServerManagement/ServerInstance.Actor.cs

@@ -336,6 +336,13 @@ private async Task StartServer(CancellationToken cancel)
             "--config-file", Path.Combine(InstanceDir, "config.toml"),
             "--data-dir", Path.Combine(InstanceDir, "data"),
         };
+
+        // Prepare the user provided arguments
+        foreach (var arg in _instanceConfig.Arguments)
+        {
+            args.Add(arg);
+        }
+
         var env = new List<(string, string)>();
 
         foreach (var (envVar, value) in _instanceConfig.EnvironmentVariables)

SS14.Watchdog/Configuration/InstanceConfiguration.cs

@@ -22,6 +22,11 @@ public sealed class InstanceConfiguration
             ? "bin/Robust.Server.exe"
             : "bin/Robust.Server";
 
+        /// <summary>
+        ///     User arguments to pass to the server process.
+        /// </summary>
+        public List<string> Arguments { get; set; } = [];
+
         /// <summary>
         /// Make a heap dump if the server is killed due to timeout. Only supported on Linux.
         /// </summary>