Splitted dynamic modules in dedicated packages

Recently, me and @anthraxx received an email requesting the relaxation of the geoip dependency in nginx.

In order to make it an optional dependency, the geoip module needs to be changed to a dynamic module, but IMO it would not make much sense to split only a single module, so I prepared a refactored package with every possible module split.

The modularization, as pointed out in the email, has been in a "wishlist" for a while with a desire to discuss it in the mailing list, but I think that today a merge request makes more sense for this.

Since this is a big change, I would like some opinions before pushing it, as I am also not the only maintainer for the package.