lists: move to separate repository and improve scripts

There are two changes in this commit. First most noticable is removal of all updater lists.

The second but more significant change is pretty much reformat of all generate scripts. It extracts common git and configuration handling from compile_pkgs to generate_common. The advantage of this is of course code sharing but also that other generate scripts now get features such as local git mirror.

Implements #201 (closed)