comply with pipeline functionality

Updated WBIRDemo to new RegistrationMethodv4 Component

    ItkImageSourceComponent

ItkImageSourceComponent

made itkImageSource templated
added itkMeshSink

adapted selxItkImageSource and selxItkImageSink accordingly

ImageSource pointers

directly an itkImage.
This is useful for bypassing the itkpipeline mechanism. (As for
elastixfilter currently). If the itkpipeline is bypassed, the (update)
control flow must be handed over to the Overlord. This is done via the
AfterRegistration mechanism in Overlord.

added RunRegistrationInterface

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.

Interface related criteria can be handled in the MeetsCriteria in the
BaseComponent as well as the iterator over criteria, other (developer-user) specific Criteria are deligated to
MeetsCriterum per iteration.

Interface related criteria can be handled in the MeetsCriteria in the
BaseComponent as well as the iterator over criteria, other (developer-user) specific Criteria are deligated to
MeetsCriterum per iteration.

- Changed to namespace selx
- Combined componentbase classes and based it on itkLightObject
- Initial combination of example components
- Made templated ComponentFactory to replace all specific factories