initial base widget implementation
fix vtkActor to vtkLODActor, initial implementation LineWidget, showWidget
remove redundant methods, implement assignment operator for widget
slight refactoring of widget system code
widget_accessor.hpp - minimize dependencies
reference counting in widget
line widget set/get line width
plane widget implementation
sphere widget implementation
circle widget and arrow widget implementation
cylinder widget implementation
cube widget implementation
coordinate system widget implementation, update pose fix
remove widget implementation
remove ModelCoefficients, remove showShape methods from viz3d
removed shape files
Merge pull request #13 from ozantonkal/implementing_widgets

Implementing widgets