tundra.tn.exception:handle - declare $exception.class in the input pipeline, since it's now being used in the service logic
tundra.tn:process and related services - add $prefix? flag to allow disabling of '$' prefixing of bizdoc, sender, and receiver input arguments (so that services implementing the WmTN/wm.tn.rec:ProcessingService specification are now supported), and $parse? flag to allow the disabling of bizdoc content parsing