Improve login UI

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/minecraft/auth/AuthFlow.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <QImage>
+#include <QList>
+#include <QNetworkReply>
+#include <QObject>
+#include <QSet>
+#include <QVector>
+
+#include "minecraft/auth/AccountData.h"
+#include "minecraft/auth/AuthStep.h"
+#include "tasks/Task.h"
+
+class AuthFlow : public Task {
+    Q_OBJECT
+
+   public:
+    explicit AuthFlow(AccountData* data, bool silent = false, QObject* parent = 0);
+    virtual ~AuthFlow() = default;
+
+    void executeTask() override;
+
+    AccountTaskState taskState() { return m_taskState; }
+
+   signals:
+    void authorizeWithBrowser(const QUrl& url);
+
+   protected:
+    void succeed();
+    void nextStep();
+
+   private slots:
+    // NOTE: true -> non-terminal state, false -> terminal state
+    bool changeState(AccountTaskState newState, QString reason = QString());
+    void stepFinished(AccountTaskState resultingState, QString message);
+
+   private:
+    AccountTaskState m_taskState = AccountTaskState::STATE_CREATED;
+    QList<AuthStep::Ptr> m_steps;
+    AuthStep::Ptr m_currentStep;
+    AccountData* m_data = nullptr;
+};