FEAT: Adding color and opacity changing capabilities for imstkGeometry.
FEAT: Adding color for text ENH: Enabling Depth peeling in vtkViewer for proper rendering of opacity. ENH: Removing unwanted functions from imstkInteractorStyle
FEAT: Adding color for text ENH: Enabling Depth peeling in vtkViewer for proper rendering of opacity. ENH: Removing unwanted functions from imstkInteractorStyle