C++: cleaned up code (comments removed, logging levels improved)

ipaacalib/cpp/CMakeLists.txt

ipaacalib/cpp/include/ipaaca/ipaaca-buffers.h

ipaacalib/cpp/include/ipaaca/ipaaca-definitions.h

ipaacalib/cpp/include/ipaaca/ipaaca-forwards.h

ipaacalib/cpp/include/ipaaca/ipaaca-internal.h

ipaacalib/cpp/include/ipaaca/ipaaca-ius.h

ipaacalib/cpp/include/ipaaca/ipaaca-json.h

ipaacalib/cpp/include/ipaaca/ipaaca-payload.h

ipaacalib/cpp/include/ipaaca/ipaaca.h

ipaacalib/cpp/include/ipaaca/util/notifier.h

ipaacalib/cpp/src/ipaaca-buffers.cc

ipaacalib/cpp/src/ipaaca-cmdline-parser.cc

ipaacalib/cpp/src/ipaaca-fake.cc

ipaacalib/cpp/src/ipaaca-internal.cc

ipaacalib/cpp/src/ipaaca-iuinterface.cc

ipaacalib/cpp/src/ipaaca-ius.cc

ipaacalib/cpp/src/ipaaca-json.cc

ipaacalib/cpp/src/ipaaca-links.cc

ipaacalib/cpp/src/ipaaca-payload.cc

ipaacalib/cpp/src/ipaaca-string-utils.cc