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).

Take into account taht this Count is not the number of elements returned in the response vector (which is the only information that render knows) but the number of elements in the result of the query at MongoDB. This information is only known by mongoBackend, so mongoBackend is the only one that can fill this.

Have a look to mongoQueryContext.cpp. You will see that the Count detail is filled at mongoBackend layer.

NTC