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.

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.