Base: Remove Boost-based signals and switch to FastSignals.

src/Mod/Measure/App/MeasureBase.h

@@ -58,7 +58,7 @@ public:
 
     App::PropertyPlacement Placement;
 
-    // boost::signals2::signal<void (const MeasureBase*)> signalGuiInit;
+    // fastsignals::signal<void (const MeasureBase*)> signalGuiInit;
 
     // return PyObject as MeasureBasePy
     PyObject* getPyObject() override;

src/Mod/Measure/Gui/TaskMeasure.h

@@ -43,7 +43,7 @@
 #include <Gui/TaskView/TaskView.h>
 #include <Gui/Selection/Selection.h>
 
-#include <boost/signals2/connection.hpp>
+#include <fastsignals/connection.h>
 
 namespace MeasureGui
 {
@@ -90,7 +90,7 @@ private:
     QAction* newMeasurementBehaviourAction {nullptr};
     QToolButton* mSettings {nullptr};
 
-    boost::signals2::connection m_deletedConnection;
+    fastsignals::connection m_deletedConnection;
 
     void removeObject();
     void onModeChanged(int index);

src/Mod/Measure/Gui/ViewProviderMeasureBase.h

@@ -168,7 +168,7 @@ protected:
     SoSeparator* pLineSeparatorSecondary;
 
 private:
-    boost::signals2::connection _mVisibilityChangedConnection;
+    fastsignals::connection _mVisibilityChangedConnection;
 };