- intermediate, does not process context or actions yet
- embedded (non-json) tests pass
- utf-8 parsing
- bring in kmx+ into ldml_test_source for parsing, but key2 is not ready eyt
- temporary scaffolding mapping key ids to vkeys
- build fixes
- getting closer.
The name json.hpp conflicts with the JSON for Modern C++ library that
is also used by Developer. Renames json.hpp and json.cpp to jsonpp.hpp
and jsonpp.cpp aka "JSON Pretty Printer".