WiiSave: Move dialogs to UI code

This moves the result dialogs to DolphinQt2, since WiiSave should not
really be responsible for interacting with the user as a simple
Wii save importing/exporting class.

This also fixes Wii save import/export showing result dialogs twice,
once from WiiSave, and another time from DolphinQt2.

Source/Core/Core/HW/WiiSave.cpp

@@ -39,28 +39,16 @@ constexpr u32 s_ng_id = 0x0403AC68;
 bool WiiSave::Import(const std::string& filename)
 {
   WiiSave save_file{filename};
-  if (save_file.Import())
-  {
-    SuccessAlertT("Successfully imported save file(s)");
-    return true;
-  }
-  PanicAlertT("Import failed");
-  return false;
+  return save_file.Import();
 }
 
-bool WiiSave::Export(u64 title_id)
+std::string WiiSave::Export(u64 title_id)
 {
   WiiSave export_save{title_id};
-  if (export_save.Export())
-  {
-    SuccessAlertT("Successfully exported file to %s", export_save.m_encrypted_save_path.c_str());
-    return true;
-  }
-  PanicAlertT("Export failed");
-  return false;
+  return export_save.Export() ? export_save.m_encrypted_save_path : "";
 }
 
-void WiiSave::ExportAll()
+std::pair<size_t, std::string> WiiSave::ExportAll()
 {
   std::string title_folder = File::GetUserPath(D_WIIROOT_IDX) + "/title";
   std::vector<u64> titles;
@@ -88,16 +76,14 @@ void WiiSave::ExportAll()
       }
     }
   }
-  SuccessAlertT("Found %zu save file(s)", titles.size());
-  u32 success = 0;
+  size_t exported_save_count = 0;
   for (const u64& title : titles)
   {
     WiiSave export_save{title};
     if (export_save.Export())
-      success++;
+      ++exported_save_count;
   }
-  SuccessAlertT("Successfully exported %u save(s) to %s", success,
-                (File::GetUserPath(D_USER_IDX) + "private/wii/title/").c_str());
+  return {exported_save_count, File::GetUserPath(D_USER_IDX) + "private/wii/title/"};
 }
 
 WiiSave::WiiSave(std::string filename) : m_encrypted_save_path(std::move(filename)), m_valid{true}

Source/Core/Core/HW/WiiSave.h

@@ -6,6 +6,7 @@
 
 #include <mbedtls/aes.h>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "Common/CommonTypes.h"
@@ -14,9 +15,13 @@
 class WiiSave
 {
 public:
+  /// Import a save into the NAND from a .bin file.
   static bool Import(const std::string& filename);
-  static bool Export(u64 title_id);
-  static void ExportAll();
+  /// Export a save to a .bin file. Returns the path to the .bin.
+  static std::string Export(u64 title_id);
+  /// Export all saves that are in the NAND. Returns the number of exported saves and a path
+  /// to the .bins.
+  static std::pair<size_t, std::string> ExportAll();
 
 private:
   explicit WiiSave(std::string filename);

Source/Core/DolphinQt2/GameList/GameList.cpp

@@ -260,11 +260,13 @@ void GameList::ExportWiiSave()
 {
   QMessageBox result_dialog(this);
 
-  const bool success = WiiSave::Export(GetSelectedGame()->GetTitleID());
+  const QString bin_path = QString::fromStdString(WiiSave::Export(GetSelectedGame()->GetTitleID()));
 
-  result_dialog.setIcon(success ? QMessageBox::Information : QMessageBox::Critical);
-  result_dialog.setText(success ? tr("Successfully exported save files") :
-                                  tr("Failed to export save files!"));
+  result_dialog.setIcon(!bin_path.isEmpty() ? QMessageBox::Information : QMessageBox::Critical);
+  if (!bin_path.isEmpty())
+    result_dialog.setText(tr("Successfully exported save files to %1").arg(bin_path));
+  else
+    result_dialog.setText(tr("Failed to export save files."));
   result_dialog.exec();
 }
 

Source/Core/DolphinQt2/MenuBar.cpp

@@ -896,13 +896,21 @@ void MenuBar::ImportWiiSave()
                                               tr("Wii save files (*.bin);;"
                                                  "All Files (*)"));
 
-  if (!file.isEmpty())
-    WiiSave::Import(file.toStdString());
+  if (file.isEmpty())
+    return;
+
+  if (WiiSave::Import(file.toStdString()))
+    QMessageBox::information(this, tr("Save Import"), tr("Successfully imported save files."));
+  else
+    QMessageBox::critical(this, tr("Save Import"), tr("Failed to import save files."));
 }
 
 void MenuBar::ExportWiiSaves()
 {
-  WiiSave::ExportAll();
+  const std::pair<size_t, std::string> result = WiiSave::ExportAll();
+  QMessageBox::information(this, tr("Save Export"),
+                           tr("Exported %n save(s) to %1", "", static_cast<int>(result.first))
+                               .arg(QString::fromStdString(result.second)));
 }
 
 void MenuBar::CheckNAND()