Remove obsolete files.
Merge remote-tracking branch 'origin' into maint-cleanup-core-test-folder
Merge branch 'develop' into maint-cleanup-core-test-folder
Merge pull request #94 from DO-CV/maint-cleanup-core-test-folder

[MAINT] Remove obsolete files in `/test/Core` folder.
Merge branch 'develop' into maint-update-third-party-eigen