Use prefix when loading tomviz modules
Use prefix when loading tomviz modules

Loading without as prefix causes issues as we have a module called
numpy, that clashes with 'numpy'!

Signed-off-by: Chris Harris <a361e89d1eba6c570561222d75facbbf7aaeeafe@kitware.com>

OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz