Add localization and boot setup

[TimL20]

• Add extra task file for derived variables and checks
• Add localization tasks (locales, timezone, ...)
• Add networking tasks (hostname, /etc/hosts, NetworkManager)
• Add boot setup tasks
  • Edit mkinitcpio hooks
  • Add systemd-boot as an (the only) options as a bootloader
• Also fixed some issues

[frankenstein91]

https://github.com/ansible-community/ansible-lint/issues/892 <-- looks like this bug and it works in VBox