WIP: some edits for ITKTransform classes

Based on previous changes, the itkTransformBaseIO and
itkTransformFileWriter/Reader classes were derived from their
template version; however, now they are restored to their legacy format
and the template versions exist in parallel with them.

ITK is built completely after changes of this patch.

Change-Id: Ic6c42b7801df9fb7a0f49f3dfe7036c437daa30c
WIP: define a template version for itkTransformIOFactory

Change-Id: I6a0451ac461a1d2ee96ede796eb3d77672bf01ce