Updated to v0.7.0 so that it’s compatible with the new RgWsPublic2 SOAP API.

Improvements since v0.6.0

• Now compatible with the RgWsPublic2 SOAP web service (new since 2023-04-20).
• Now possible to make SOAP API calls using different credentials in %Auth{} structs, e.g. for multi-tenant setups.
• Now needs no application setup in config.exs or mix.exs, thanks to getting rid of the Soap library due to parsing issues, and because it seems abandoned and not particularly robust to begin with.
• XML parsing is now handled directly with SweetXml.
• Actual logging of errors in the %Results{} struct means you can find out what went wrong.
• Actual handling of errors (with {:ok, ...} and {:error, ...} tuples along the pipeline across all modules means that no API call or parsing of the XML response body is made unless no errors have popped up.

Updated to v0.8.0. The main motivation was to replace HTTPoison with Req, as the previous dependency made this incompatible with Phoenix projects. There are also new high-level functions fetch/1 and fetch!/1 that take keyword options as arguments.