Added WorkManager to manage background tasks.

Relies heavily on the QThreadPool.

core/WorkManager.h

@@ -0,0 +1,20 @@
+#ifndef WORKMANAGER_H
+#define WORKMANAGER_H
+
+#include <functional>
+#include <memory>
+
+class QRunnable;
+
+class WorkManager {
+public:
+
+	static std::shared_ptr<WorkManager> getWorkManager();
+
+	using Work = std::function<void()>;
+	virtual void addRunnable(QRunnable *runnable) = 0;
+	virtual void addWork(Work work) = 0;
+
+};
+
+#endif // WORKMANAGER_H