Create a separate package for control files

This solves the current issues with control files:
- They are in Yast's Git , but need to be copied manually to OBS to several different packages
- It's not obvious what needs to be done after editing the files
- After modifying the files in OBS the changes need to be synced back to Git manually

This is the initial version. However, the profiles were copied from [yast/yast-installation](https://github.com/yast/yast-installation/tree/master/control) **with history** so this pull request contains some extra commits related to cleanup and adapting it for a separate package.

A separate package is needed to decrease dependencies, `yast2-installation` has huge dependencies, this depends only on `yast2-devtools`.

The package already builds in [YaST:Head/yast2-installation-control](https://build.opensuse.org/package/show/YaST:Head/yast2-installation-control).

 (The relevant `skelcd-control-*` packages still need to be adapted to use this.)