Make locale generation and keymap/font setting part of system configuration

* remove auto_locale and auto_keymap_font workers, no need for middle-man.
* call relevant code directly from prefill_configs, which is now renamed to
  preconfigure_target
* make base procedure run preconfigure_target in configure_system worker.
  (this also removes the need for the configure_system worker definition
  in the automatic procedure)
* warn user in interactive_configure_system() when preconfigure_target()
  failed, and allow him to go back
* simplify interactive worker_install_packages () a little bit

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