GH-3392 Switch MS account login to use device flow instead

Device flow involves the user manually opening a web page and putting in
a code. We no longer need to interact with the browser.

launcher/dialogs/MSALoginDialog.h

@@ -17,6 +17,7 @@
 
 #include <QtWidgets/QDialog>
 #include <QtCore/QEventLoop>
+#include <QTimer>
 
 #include "minecraft/auth/MinecraftAccount.h"
 
@@ -46,10 +47,17 @@ slots:
     void onTaskSucceeded();
     void onTaskStatus(const QString &status);
     void onTaskProgress(qint64 current, qint64 total);
+    void showVerificationUriAndCode(const QUrl &uri, const QString &code, int expiresIn);
+    void hideVerificationUriAndCode();
+
+    void externalLoginTick();
 
 private:
     Ui::MSALoginDialog *ui;
     MinecraftAccountPtr m_account;
-    std::shared_ptr<Task> m_loginTask;
+    std::shared_ptr<AccountTask> m_loginTask;
+    QTimer m_externalLoginTimer;
+    int m_externalLoginElapsed = 0;
+    int m_externalLoginTimeout = 0;
 };