nixos/vdr: add option user/group and more admin control

- Add option to set user and group name
- Set users home to runtime directory, to avoid mixing of temporal files
  like caches
- Allow admin to control LIRC service by avoiding LIRC enabling
- Allow admin to set libDir, by removing setting argument config to default
- Add package to environment, to allow easy access for admins to helper
  tools like svdrpsend and vdr -h
- Cleanup Nix code by avoiding with statement

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