Add core_packages.txt, check_updates.sh,  compare_packages.sh and packages.yaml to the tools directory (#1949)

* Add check_updates.sh script and packages.yaml

Update packages.yaml

Update packages.yaml

Update packages.yaml

Add compare_packages.sh

Correct c_ares download url

Add new packages to packages.yaml

Update packages.yaml

- Add core_packages.txt
- Add options to limit checks in check_updates.sh

Update packages.yaml

* Update packages.yaml

* Update packages.yaml