COMP: Ensure TubeTK CLI build against Slicer register the ITKIO factories

This commit fixes the problem  avoiding forcing the CLI library wrapper
variable into the cache.

Forcing the values into the cache is not needed because

 (1) when TubeTK is built standalone it will use the default wrapper
provided by the SlicerExecutionModel

and

 (2) when TubeTk is build against Slicer, the SlicerConfig.cmake will
set the Slicer SEM wrapper variables in the current scope that
will then be picked up automatically by the following call to
find_package(SlicerExecutionModel)

As detailed in (1), this commit also remove the uneeded tubeTk CLI wrapper.

Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>
COMP: Ensure TubeTK CLI build against Slicer register the ITKIO factories

    This commit fixes the problem  avoiding forcing the CLI library wrapper
    variable into the cache.

    Forcing the values into the cache is not needed because

     (1) when TubeTK is built standalone it will use the default wrapper
    provided by the SlicerExecutionModel

    and

     (2) when TubeTk is build against Slicer, the SlicerConfig.cmake will
    set the Slicer SEM wrapper variables in the current scope that
    will then be picked up automatically by the following call to
    find_package(SlicerExecutionModel)

    As detailed in (1), this commit also remove the uneeded tubeTk CLI wrapper.

    Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>
Merge pull request #376 from cdeepakroy/fix-tubetk-build-against-Slicer-cleaned

COMP: Ensure TubeTK CLI build against Slicer register the ITKIO factorie...
Merge remote-tracking branch 'upstream/master' into ComputeTubeFlyThroughImage
Added code to produce the fly through version of the tube mask in addition
to that of the input image
Merge pull request #373 from cdeepakroy/RetrieveLocalRidgeInformation

Added functions to itktubeRidgeExtractor for retrieving ridge information at current location
BUG: Removed set(ITK_NO_IO_FACTORY, 1). Now handled by Slicer, GenerateCLP
BUG: Missing find_package(ITK) in projects
Merge pull request #377 from aylward/IOFactory

Io factory
Merge remote-tracking branch 'upstream/master' into ComputeTubeFlyThroughImage
Tested ComputeTubeFlyThroughImage Module on some synthetic and real data and fixed bugs.