Combine launch buttons in Instance window, persist profiler

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

launcher/NullInstance.h

@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: GPL-3.0-only
 /*
- *  PolyMC - Minecraft Launcher
+ *  Prism Launcher - Minecraft Launcher
  *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
+ *  Copyright (C) 2023 TheKodeToad <TheKodeToad@proton.me>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -110,6 +111,9 @@ public:
     {
         return false;
     }
+    void populateLaunchMenu(QMenu* menu) override
+    {
+    }
     QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override
     {
         QStringList out;