Generic request content-type preserved in request not reconstituted.

Using a Cumulocity IoT GenericRequest event to send JSON data to Cumulocity IoT is no longer sensitive to the case used when specifying the content-type in the header.

Requests created via CumulocityRequestInterface.createRequest() do not include application key (if available).

The X-Cumulocity-Application-Key header is now included in requests from Apama to Cumulocity IoT using the CumulocityRequestInterface, which means that the deviceRequestCount will not include Apama requests.