BUG: Fix linking of factory register method on static windows

This patch fixes link errors such as the following:
error LNK2019: unresolved external symbol "__declspec(dllimport) void
__cdecl itk::BioRadImageIOFactoryRegister__Private(void)"

Remove ITK_ABI_IMPORT declaration attribute from private factory
registration methods declared in the automatic registration from
UseITK. ITK_ABI_IMPORT is always defined to import, independently of
static or shared itk libraries. The private factory registration
method must not be defined as imported from static libraries on windows.

Change-Id: I7066828602f00b59403726e1acc12785f9da49f7
MetaIO: Removed the deprecated _CM24 CMake variables

These were introduced for CMake 2.4 installation paths, and were
deprecated in favor of VTK_INSTALL_*_DIR variables.

Author: Marcus D. Hanwell <marcus.hanwell@kitware.com>
WIP: writer works for all input formats, reader works for hdf5

Currently in the transform reader/writer classes of itk, the template
argument reflects the internal precision type of the input transform.
However, these classes should be able to get the input transform
precision type internally, and they should ask users just about the
expected precision type of the output transform.

Two different methods are used for Reader and Writer:

-Enhance TransformFileReader:
we convert the parameters value types instantly when we read them
from transform buffer. Minimum changes are needed and just three
files (itkHDF5/Txt/MatlabTransformIO.hxx) are affected.

-Enhance TransformFileWriter:
Main changes are applied to "itkTransformFileWriter.hxx" file.
In this file "SetInput(TransformBaseTemplate<T> *transform)" has
been changed to "SetInput(Object *transform)". While setting the
input transform, we cast its parameters value types to the requested
precision type one by one. Then, we continue the writing procedure
as before using the new converted input transform.

Change-Id: I7b008d5afed9218e60e52fda284c10133e16811a
WIP: modify AddTransform in TransFileWriter

Change-Id: Ibbc1e54df6b7bdf1c94e1382b086c0025d1aea61