Qt: Skip emulator-specific things on startup if starting in manager mode:

- Don't try to read 86box.cfg;
- Don't initialize subsystems that aren't used in manager mode;
- Ignore `-I` or `-X` command-line options;
- Don't block keyboard navigation and mnemonics in menus;
- Don't perform UUID/WinBox/cpu_override checks.

src/qt/qt_main.cpp

@@ -561,13 +561,11 @@ main(int argc, char *argv[])
     }
 #endif
 
-    qt_set_sequence_auto_mnemonic(false);
     Q_INIT_RESOURCE(qt_resources);
     Q_INIT_RESOURCE(qt_translations);
     QSurfaceFormat fmt = QSurfaceFormat::defaultFormat();
     fmt.setSwapInterval(0);
     QSurfaceFormat::setDefaultFormat(fmt);
-    app.setStyle(new StyleOverride());
 
 #ifdef __APPLE__
     CocoaEventFilter cocoafilter;
@@ -586,6 +584,10 @@ main(int argc, char *argv[])
         return 0;
     }
 
+    if (!vmm_enabled)
+        qt_set_sequence_auto_mnemonic(false);
+    app.setStyle(new StyleOverride());
+
     bool startMaximized = window_remember && monitor_settings[0].mon_window_maximized;
     fprintf(stderr, "Qt: version %s, platform \"%s\"\n", qVersion(), QApplication::platformName().toUtf8().data());
     ProgSettings::loadTranslators(&app);
@@ -619,6 +621,19 @@ main(int argc, char *argv[])
         return 6;
     }
 
+    if (vmm_enabled) {
+        // VMManagerMain vmm;
+        // // Hackish until there is a proper solution
+        // QApplication::setApplicationName("86Box VM Manager");
+        // QApplication::setApplicationDisplayName("86Box VM Manager");
+        // vmm.show();
+        // vmm.exec();
+        const auto vmm_main_window = new VMManagerMainWindow();
+        vmm_main_window->show();
+        QApplication::exec();
+        return 0;
+    }
+
     // UUID / copy / move detection
     if(!util::compareUuid()) {
         QMessageBox movewarnbox;
@@ -681,19 +696,6 @@ main(int argc, char *argv[])
               return 0;
     }
 
-    if (vmm_enabled) {
-        // VMManagerMain vmm;
-        // // Hackish until there is a proper solution
-        // QApplication::setApplicationName("86Box VM Manager");
-        // QApplication::setApplicationDisplayName("86Box VM Manager");
-        // vmm.show();
-        // vmm.exec();
-        const auto vmm_main_window = new VMManagerMainWindow();
-        vmm_main_window->show();
-        QApplication::exec();
-        return 0;
-    }
-
 #ifdef DISCORD
     discord_load();
 #endif