Enhance web actions with formdata input and binary data output.

Pass transaction id in case of errors.

Add support for formdata.

Allow binary content type: The http web action must respond with either a plain text body or a base64 encoded body.
The header content-type must be set to interpret the reponse if base64 encoded body is given. (This applies to a JSON response as well.)
Content-type must be one of known Spray types - no custom headers permitted.
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