Implement legacy forge button!

Many refactors of the task system.
Progress dialog now accepts generic ProgressProvider objects

logic/tasks/ProgressProvider.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <QObject>
+class ProgressProvider : public QObject
+{
+	Q_OBJECT
+protected:
+    explicit ProgressProvider(QObject* parent = 0): QObject(parent){}
+signals:
+	void started();
+	void progress(qint64 current, qint64 total);
+	void succeeded();
+	void failed(QString reason);
+	void status(QString status);
+public:
+	virtual QString getStatus() const = 0;
+	virtual void getProgress(qint64 &current, qint64 &total) = 0;
+	virtual bool isRunning() const = 0;
+public slots:
+	virtual void start() = 0;
+};