- no-arg method will now be a send (instead of receive) if @Payload is present
- added 'method' to the evaluation context variables with the String value of the invoked method's name
- added test for new gateway no-arg method send option
- enable 'payload-expression' in XML for no-arg methods
- use per-method-invocation evaluation context for header expressions (provides 'args' and 'method' as context variables)
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