ComponentSelector

The ItkSmoothingRecursiveGaussianImageFilterComponent is templated over
the dimensionality and pixeltype of in- and output. Stings "Dimensionality" and
"PixelType" are added as Criteria to select the right Component.

- Automatically write pixel type and dimension to parameter file from
image type at runtime
- Default parameter maps
- Lots of fixes

TODO: Superclass GetOutput() does not trigger Update() as it should

Blueprint::ParameterMapType

As of this commit the transformix filter executes correctly on
call to GetOutput(), but calling GetOutput on the elastix filter
does not trigger an Update() as it should