Adaption of FreeCAD to QuarterWidget

-removes all soqtviewer references
-create a quarter adaptor class which implements missing functionality
-adopts freecad code to make use of SoRenderManager and changed View3DInventorViewer  interface

src/Main/FreeCADGuiPy.cpp

@@ -31,7 +31,6 @@
 #include <QApplication>
 #include <QIcon>
 #include <QThread>
-#include <Inventor/Qt/SoQt.h>
 #if defined(Q_OS_WIN)
 #include <windows.h>
 #elif defined(Q_WS_X11)
@@ -46,7 +45,8 @@
 #include <Gui/BitmapFactory.h>
 #include <Gui/MainWindow.h>
 #include <Gui/SoFCDB.h>
-
+#include <Gui/Quarter/Quarter.h>
+#include <Inventor/SoDB.h>
 
 static
 QWidget* setupMainWindow();
@@ -163,7 +163,7 @@ FreeCADGui_setupWithoutGUI(PyObject * /*self*/, PyObject *args)
     if (!SoDB::isInitialized()) {
         // init the Inventor subsystem
         SoDB::init();
-        SoQt::init("FreeCAD");
+        SIM::Coin3D::Quarter::Quarter::init();
     }
     if (!Gui::SoFCDB::isInitialized()) {
         Gui::SoFCDB::init();
@@ -260,7 +260,7 @@ QWidget* setupMainWindow()
         if (!SoDB::isInitialized()) {
             // init the Inventor subsystem
             SoDB::init();
-            SoQt::init(mw);
+            SIM::Coin3D::Quarter::Quarter::init();
             Gui::SoFCDB::init();
         }