(split) ENH: Upgrade to ITKv4
(split) ENH: Upgrade to ITKv4

Many files were using OStringStream.
Some changes for itkColorTable.
Removed ifdef ITK_USE_REVIEW_STATISTICS for new statistics.
Removed references to itkOrientedImage.
Removed itkBrains2MaskImageIOFactory
Replaced Rigid3DTransform with VersorRigid3DTransform.

ENH: Converted to fltk 1.3.x.
This was the most work because of fltk API changes since 1.1.
include <FL/fl_file_chooser.H> -> include <FL/Fl_File_Chooser.H>
fltk_zlib is now fltk_z

ENH: Use ITK_LIBRARIES instead of specific libs.
This is in preparation for itk modularization.

COMP: Properly handle MINGW dllexport/import.

Change-Id: I8440716b6ced59c9e61412fc32798789bf9e50a5

thewtex/ImageViewer,aylward/ImageViewer,KitwareMedical/ImageViewer