TODO: Test fails because of problems with setting up multiple instances
of xout in the same process

Also introduces the “SUPERELATIX_RUN_LONG_TESTS” option that disables
long running tests by default (e.g. 3D and 4D registration tests)

WIP: Segmentation fault when trying to access result image

This build fails because VectorContainer has a private default
constructor

Model the GoogleTest build after SimpleITK. This fixes previous build
errors.

Revert "Revert "Merge branch 'ELASTIX-9-blueprints' of https://github.com/kaspermarstal/SuperElastix into ELASTIX-12-implement-componentdatabase""

This reverts commit 620dd446a6a6c01657e9d96aa12091ce23886966.

Revert "Merge branch 'ELASTIX-9-blueprints' of https://github.com/kaspermarstal/SuperElastix into ELASTIX-12-implement-componentdatabase"

This reverts commit 05e8e7605274f15923bd311b45a98be16686b18c, reversing
changes made to 86f7b5ebfc974553fc581004dc0abe203d69a703.

ObjectFactoryBase anymore

ENH: ELASTIX-1 Add unit test XML report and test harness for handling configuring test data at test compile time

Test data can now be added by only placing a content link in the
Testing/Unit/Data/Input and Baseline folders. Prevously, the dev
also had to add the path of the content link to a CMake variable.