softmaker-office, freeoffice: make it easy to override versions

Make the edition, version, and hash easier to override to support
users who have a license for an older version of Softmaker Office.
With this change one can e.g. use Softmaker Office 2018 with:

softmaker-office.override {
  officeVersion = {
    edition = "2018";
    version = "976";
    sha256 = "0j6zm0cbxrcgm7glk84hvvbp4z0ys6v8bkwwhl5r7dbphyi72fw8";
  };
}

This also helps people fix things when upstream has replaced the
previous version's tarball and this hasn't been fixed in nixpkgs yet.

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