NOISSUE some safe refactors and changes of the task subsystem

Possibly also some bug fixes.

application/GuiUtil.cpp

@@ -33,7 +33,7 @@ QString GuiUtil::uploadPaste(const QString &text, QWidget *parentWidget)
 	}
 
 	dialog.execWithTask(paste.get());
-	if (!paste->successful())
+	if (!paste->wasSuccessful())
 	{
 		CustomMessageBox::selectable(parentWidget, QObject::tr("Upload failed"),
 									 paste->failReason(), QMessageBox::Critical)->exec();

application/LaunchController.cpp

@@ -103,7 +103,7 @@ void LaunchController::login()
 				progDialog.setSkipButton(true, tr("Play Offline"));
 			}
 			progDialog.execWithTask(task.get());
-			if (!task->successful())
+			if (!task->wasSuccessful())
 			{
 				auto failReasonNew = task->failReason();
 				if(failReasonNew == "Invalid token.")

application/dialogs/ProgressDialog.cpp

@@ -116,7 +116,7 @@ bool ProgressDialog::handleImmediateResult(QDialog::DialogCode &result)
 {
 	if(task->isFinished())
 	{
-		if(task->successful())
+		if(task->wasSuccessful())
 		{
 			result = QDialog::Accepted;
 		}

application/widgets/ProgressWidget.cpp

@@ -48,12 +48,12 @@ bool ProgressWidget::exec(std::shared_ptr<Task> task)
 	{
 		loop.exec();
 	}
-	return task->successful();
+	return task->wasSuccessful();
 }
 
 void ProgressWidget::handleTaskFinish()
 {
-	if (!m_task->successful())
+	if (!m_task->wasSuccessful())
 	{
 		m_label->setText(m_task->failReason());
 	}