GH-1053 explode launch task into many small steps, each a Task

logic/auth/YggdrasilTask.cpp

@@ -73,12 +73,13 @@ void YggdrasilTask::heartbeat()
 	progress(count, timeout_max);
 }
 
-void YggdrasilTask::abort()
+bool YggdrasilTask::abort()
 {
 	progress(timeout_max, timeout_max);
 	// TODO: actually use this in a meaningful way
 	m_aborted = YggdrasilTask::BY_USER;
 	m_netReply->abort();
+	return true;
 }
 
 void YggdrasilTask::abortByTimeout()

logic/auth/YggdrasilTask.h

@@ -131,7 +131,7 @@ slots:
 	void changeState(State newState, QString reason=QString());
 public
 slots:
-	virtual void abort() override;
+	virtual bool abort() override;
 	void abortByTimeout();
 	State state();
 protected: