AchievementManager: Use HookableEvent instead of std::function callbacks

The callback mechanism AchievementManager had until now only supported
one caller registering a callback, and it didn't have any
synchronization. This isn't a problem for DolphinQt, but the PR to add
Android support for RetroAchievements exposes these problems. Let's
replace it with HookableEvent, which can handle all of this.

Source/Core/DolphinQt/Achievements/AchievementsWindow.cpp

@@ -30,12 +30,16 @@ AchievementsWindow::AchievementsWindow(QWidget* parent) : QDialog(parent)
 
   CreateMainLayout();
   ConnectWidgets();
-  AchievementManager::GetInstance().SetUpdateCallback(
+
+  m_event_hook = AchievementManager::UpdateEvent::Register(
       [this](AchievementManager::UpdatedItems updated_items) {
         QueueOnObject(this, [this, updated_items = std::move(updated_items)] {
           AchievementsWindow::UpdateData(std::move(updated_items));
         });
-      });
+      },
+      "AchievementsWindow");
+  UpdateData(AchievementManager::UpdatedItems{.all = true});
+
   connect(&Settings::Instance(), &Settings::EmulationStateChanged, this,
           [this] { m_settings_widget->UpdateData(RC_OK); });
 }

Source/Core/DolphinQt/Achievements/AchievementsWindow.h

@@ -6,6 +6,7 @@
 #ifdef USE_RETRO_ACHIEVEMENTS
 #include <QDialog>
 
+#include "Common/HookableEvent.h"
 #include "Core/AchievementManager.h"
 
 class AchievementHeaderWidget;
@@ -35,6 +36,8 @@ private:
   AchievementProgressWidget* m_progress_widget;
   AchievementLeaderboardWidget* m_leaderboard_widget;
   QDialogButtonBox* m_button_box;
+
+  Common::EventHook m_event_hook;
 };
 
 #endif  // USE_RETRO_ACHIEVEMENTS

Source/Core/DolphinQt/MenuBar.cpp

@@ -294,8 +294,8 @@ void MenuBar::AddToolsMenu()
       tools_menu->addAction(tr("Achievements"), this, [this] { emit ShowAchievementsWindow(); });
 #ifdef RC_CLIENT_SUPPORTS_RAINTEGRATION
   m_achievements_dev_menu = tools_menu->addMenu(tr("RetroAchievements Development"));
-  AchievementManager::GetInstance().SetDevMenuUpdateCallback(
-      [this] { QueueOnObject(this, [this] { this->UpdateAchievementDevelopmentMenu(); }); });
+  m_raintegration_event_hook = AchievementManager::DevMenuUpdateEvent::Register(
+      [this] { QueueOnObject(this, [this] { UpdateAchievementDevelopmentMenu(); }); }, "MenuBar");
   m_achievements_dev_menu->menuAction()->setVisible(false);
 #endif  // RC_CLIENT_SUPPORTS_RAINTEGRATION
   tools_menu->addSeparator();

Source/Core/DolphinQt/MenuBar.h

@@ -12,6 +12,9 @@
 #include <QPointer>
 
 #include "Common/CommonTypes.h"
+#ifdef RC_CLIENT_SUPPORTS_RAINTEGRATION
+#include "Common/HookableEvent.h"
+#endif  // RC_CLIENT_SUPPORTS_RAINTEGRATION
 
 class QMenu;
 class ParallelProgressDialog;
@@ -299,4 +302,8 @@ private:
   QAction* m_jit_register_cache_off;
 
   bool m_game_selected = false;
+
+#ifdef RC_CLIENT_SUPPORTS_RAINTEGRATION
+  Common::EventHook m_raintegration_event_hook;
+#endif  // RC_CLIENT_SUPPORTS_RAINTEGRATION
 };