Merge: nitpackage: generate ini files

This PR replace the old `nit-makepackage` sheel script by an option in the `nitpackage` tool.

`nitpackage` is now able to generate `package.ini` files automatically with the following command:

```sh
nitpackage lib/ --gen-ini
```

As examples, I provide two generated ini files:
* `lib/fca/package.ini`
* `lib/vsm/package.ini`

Both file were generated with `nitpackage`, I only edited manually the `tags` and `desc` keys.

Please ignore the three first commits as they belong to #2652.

Pull-Request: #2653
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Jean Privat <jean@pryen.org>