nixos/privoxy: add https and settings options

This is a major rewrite of the Privoxy module:

- As per RFC0042, remove privoxy.extraConfig and replace it
  with a privoxy.settings option, which maps a NixOS freeform
  submodule to the Privoxy configuration format.

- Move all top-level options that mirrored a setting to
  the real ones in privoxy.settings. This still keeps the
  type-checking, default values and examples in places.

- Add two convenience options: userActions and userFilters, which
  simplify the operation of creating a file with pkgs.writeText,
  converting it to a string and adding it to the actionsfile/
  filterfile list.

- Add a privoxy.inspectHttps option to automagically setup TLS
  decryption support. I don't know how long have been waiting
  for this feature: can't believe it has just happened.

- Also add a privoxy.certsLifetime to control the periodical
  cleanup of the temporary certificates generate by Privoxy.

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