load mesh function is finalized: color range is always 0-255 and RGB due to vtkPLYReader limitations

remove cloudactormap, shapeactormap. only vtkProp is stored and view transformation can be obtained using GetUserMatrix of vtkProp3D

Acess by name infrastructure

fixes based on the feedback: window name prefix is automatically added when it is not there, singleton class returns reference instead of pointer, destructor is private, release function implemented

initial shared pointer implementation for Viz3d, singleton VizAccessor, cv::viz::get function initial implementation

Implementing camera

principal point is always set even though the intrinsic parameters are not given (center of window), fixed computation mistakes in setWindowSize in camera class