Removed the last section of the installer that allowed the user to install optional software. The reason is that the system installation should be prioritized before installing extra packages. This removes a section that has given many problems to the maintainers. However, it is intended to be added in a future post-installation script.

Anarchy is composed of numerous interconnected scripts. A variable is in charge of storing the packages that the user wants to install. However, even with the changes added with this commit, there are package names in several scripts, which makes maintenance in case of having to verify or remove any of them extremely complex and cumbersome. With these changes a new file is added, anarchy-packages.ini, which will store variables with the package sets that are required by the installer. At the same time, a new directory is added that will store tests. In principle, check_pkgs.sh has been added, which quickly checks if any package offered by the installer has been removed from the official repos or has changed its name. In the future we intend to use this script for continuous integration or even a pre-check before the installer starts the installation.

The gnome-screensaver package has been removed as it is not available in the official repositories.

It was removed from the official repositories

egrep is non-standard and deprecated.
Shellcheck code: SC2196
https://github.com/koalaman/shellcheck/wiki/SC2196