feat: start/stop server handling

The original app volume is also restored when the server is stopped.

Addons/GBSUServer.cs

@@ -4,6 +4,7 @@ using GB.Core;
 using GB.Game;
 using HarmonyLib;
 using UnityEngine;
+using UnityEngine.SceneManagement;
 
 #pragma warning disable IDE0051 // Private member is unused
 
@@ -34,11 +35,33 @@ public class GBSUServer : MonoBehaviour
 
     public static void StartServer()
     {
+        Helper.hosting = true;
+        AudioListener.volume = 0; // mute game audio
+
+        Plugin.AddServerComp(); // add custom GBSU server component
+
         RotationConfig gameConfig = GBConfigLoader.LoadRotationConfig(null); // the argument doesn't matter as we do stuff in the method
         ServerConfig serverConfig = NetConfigLoader.LoadServerConfig(); // load default server config, because it can be overridden by args like -ip and -port
         MonoSingleton<Global>.Instance.UNetManager.LaunchServer(serverConfig); // launch the server with the server config
         MonoSingleton<Global>.Instance.UNetManager.GetComponent<GameManagerNew>().ChangeRotationConfig(gameConfig, 0); // set server's rotationconfig
     }
+
+    public static void StopServer()
+    {
+        // WIP: At the moment the only way to stop the server is to exit/kill the game
+        Helper.hosting = false;
+
+        AudioListener.volume = Helper.saved_volume; // restore volume
+
+        // stop network listener
+        MonoSingleton<Global>.Instance.UNetManager.StopServer();
+
+        // destroy GBSU server comp
+        Plugin.DestroyServerComp();
+
+        // go back to main menu
+        SceneManager.LoadScene("Menu");
+    }
     /*
     public string GetRemainingRoundTime()
     {