Made step to remove ASyncWindow in favour of usage of Future and FutureWatcher.

This should allow concurrency in the plugins to be independent from their container.

Contains also some work on the system for registering plugins.

core/ControllableTask.h

@@ -12,8 +12,9 @@ template <class T>
 class ControllableTask
 {
 public:
+	using Result = T;
 	virtual ~ControllableTask() {}
-	virtual T run(TaskControl& control) = 0;
+	virtual Result run(TaskControl& control) = 0;
 };
 
 #endif // CONTROLLABLETASK_H

core/RunControllableTask.h

@@ -7,14 +7,16 @@
 
 #include <QFutureInterface>
 #include <QRunnable>
+#include <QThreadPool>
 #include "ControllableTask.h"
+#include "TaskControl.h"
 
 template <typename T>
 class RunControllableTask : public QFutureInterface<T> , public QRunnable
 {
 public:
 	RunControllableTask(ControllableTask<T>* tsk) : task(tsk) { }
-	virtial ~RunControllableTask() { delete task; }
+	virtual ~RunControllableTask() { delete task; }
 
 	QFuture<T> start()
 	{

core/TaskControl.h

@@ -7,8 +7,7 @@
 
 #include <QFutureInterfaceBase>
 
-class TaskControl
-{
+class TaskControl {
 public:
 	TaskControl(QFutureInterfaceBase *f) : fu(f) {  }
 	bool shouldRun() const { return !fu->isCanceled(); }

core/TaskExecutor.h

@@ -6,7 +6,7 @@
  */
 #include "ControllableTask.h"
 #include "RunControllableTask.h"
-
+#include <QFuture>
 /**
  * @brief The TaskExecutor class
  *