Plugins/vtk/vis3D: Delete old toolbar.
Plugins/vtk/vis3D: removed old toolbar code from init.
Plugins/vtk/Filters: WIP on contours.
Plugins/vtk/Surface: adjusting mesh class to changes.
Plugins/vtk/vis3D: added method to gerenerate contours on events handler.
Plugins/vtk/vis3D: actions for contours interation.