[CMake] add extension to fix CMP0115

[Fix] add destructor to avoid memory leak.

While here, add a symlink to test_data if the build directory is not the
root one

clarified documentation on CWW

Release of version 4.5.1.

Release of version 4.5.0.

run-clang-tidy-6.0.py -header-filter='.*' -checks='llvm-header-guard' -fix

Cleaning

Revert "Cleaning"

Thanks for the work !