add default quarter files
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
Adopt mouse selection to quarter widget

Quarter Widget soes not allow to switch of multisampling on the fly, therefore we need to use glgraphicsitem instead of direct opengl xor rendering for mouse selection
add View3DInventorViewer python interface
As quarter is not wrapped by SWIG we need to expose our own python interface class.
This is a start with the most important functions to access the render and event
manager. Furthermore all extra functions available next to the swig wrapper functions
are exposed. Everything else can be added when needed.
Port QuarterWidget to QGraphicsView
Derive from QGraphicsView instead of QGLWidget to allow to add widgets as overlay over the 3d scene later on.
fix reported bugs
- compile on windows
- fix cursors
fix rotation center after view all
ensure that the glwidget is returned
fix backlight issue
fix qt moc warnings
fix framerate rendering
+ fix build error
+ set fix precision for FPS counter
+ fixes #0001762: Update 'About FreeCAD' Screen
+ fix warnings with clang
+ fix warnings with clang
+ fix warnings with clang
+ fix warnings with clang
+ add option to disable automatic fit to view when loading data file
+ fix typos