URL-parsing+rendering part of the first two new convops ready

### Description
This PR implements the parsing of URL plus the rendering in XML and JSON of the first (/v1/contextTypes) of the batch of new convenience operations. A second new conv op is prepared for but not terminated (/v1/contextTypes/{entityType})

What is missing is the mongo part (see '#if 0' in serviceRoutines).

The 'for' could also take care of this limit
However, this is a break and you break right out of the for-loop so it is ok.
The 'continue' is different, that one keeps you in the for-loop doing absolutely nothing until ix == offset ...
 
NTC