TFixedImage as the ImageSource template since the output image is
always resampled to the fixed image domain.

TODO: Fix 'error while setting up xout' error when running multiple
ElastixFilters in the same binary (see ELASTIX-56 in SuperElastix Jira)

Adds a stand-alone ITK filter that wraps the elastix library
in a fully pipeline-compatible process object. The original
library interface was deprecated in favor of direct use of
elastix internals in the filter's GenerateData() for more
control over pipeline inputs and outputs.

TODO: Support multiple fixed and moving images
TODO: Return TransformParameters

WIP: Segmentation fault when trying to access result image

'ELASTIX-12-implement-componentdatabase' into develop

Conflicts:
	Modules/Core/elxModuleCore.cmake
	Testing/Unit/CMakeLists.txt

This build fails because VectorContainer has a private default
constructor

Fix an issue with compilation of ITK v4.8.1 on Mac OS X
Add CMakeLists.txt to root folder

Conflicts:
	CMakeLists.txt
	Modules/Core/elxModuleCore.cmake
	SuperBuild/CMakeLists.txt
	Testing/Unit/CMakeLists.txt

Merge branch 'ELASTIX-24-Component-Interface-Handshake' of https://github.com/kaspermarstal/SuperElastix into ELASTIX-24-Component-Interface-Handshake

Conflicts:
	Modules/Core/ComponentInterface/GDOptimizer4thPartyComponent.cxx
	Modules/Core/ComponentInterface/Interfaces.hxx