Make index.php files and header management easier about php-dev-tools

[matks]

If I'm not wrong, php-dev-tools now fits 100% of the needs for header management (and we are deploying it on every native modules).

Then comes the question of autoindex.

So I guess, to fit 100% of the needs of "have a index.php in all folders to secure" we need

• a CLI tool able to put the right index.php file (with license headers) in every folders and subfolders of targeted folder (+ ability to exclude some folders)
• the CLI tool must be embedded into php-dev-tools
• it needs to be documented
• the CLI tool needs a dry-run option so we can run it in a GitHub Action
• we need to deploy it on every native modules to make it a standard

Did I forget something ?

[Progi1984]

👍 @matks