Revert "[FIX] Some MSVC warnings related to the use of unsafe functions (fopen, sscanf)."

This reverts commit 60105a1b9fafadd5151995ab06fb243b2b0455f9.
Revert "The unit tests with files(s) fail every time if the binary (Open3DMotionTest) is not in the folder 'src' as paths are relative. This revision create global path based on the configuration of CMake. "

This reverts commit 6c2b3c0a2794bf3fb3dfd65b34700949d9a1cf73.
Revert "Global path set instead of relative path for the files used in some new unit tests."

This reverts commit c1444b43ad8a46e1ed05c047bb452ef1167f8f86.