Also changed constructors of PayloadEntryProxy to protected.

Create doxygen documentation thus:
$ cd docs
$ doxygen ipaacaCpp.Doxyfile

Address mode must be selected explicitly using as_map/as_list, like so:
  for (auto value: iu->payload()["listItem"].as_list()) { .... }
  for (auto kv_pair: iu->payload()["mapItem"].as_map()) { .... }
Generic size() function (reports 0 for non-structured types)

PayloadTypeConversionError thrown if (trimmed) string parse is
incomplete; comparison operators == and != catch this error though.

Setting default channel name and default payload type works OK

Sniffer: only display quotes for string-type payload values
Injector: using unicode() and catching errors

TODO: compatibility with STR legacy payloads; more varied
access to inner payload objects (e.g. push_back)

It is a fast header-only 3rd party lib which does not have
packages on all systems - so I just copied it into include/

It is Herwin's resend fix. Test sources are present but not
enabled during library build (will have to implement test build asap).

fixed overlapping InputBuffer constructors and added BufferConfiguration and BufferConfigurationBuilder

Added BufferConfigurationBuilder to Cpp implementation. Added Channel getter to IUInterface in Cpp implementation. Old constructor interfaces are unchanged to pre-channel versions in Cpp implementation. Added new constructor with BufferConfiguration-parameter for channel usage.

Added ipaaca channel possibilities based on rsb scope. Also, deprecated incompatible InputBuffer constrcutors for non-container parameters for multiple categories, from cpp version