Write converted object and CSG metadata for debugging

[sethrj]

This adds lots of delicious JSON diagnostic output to the ORANGE converter. The way to generate this currently (and to build the full ORANGE surface input at the same time) is to use the 'converter' unit test:

$ GDML=foo.gdml ./test/orange/orange_g4org_Converter --gtest_filter=ConverterTest.DISABLED_arbitrary --gtest_also_run_disabled_tests
# Generate the global universe (id 0)
$ ../scripts/user/orange-csg-to-dot.py -u 0 foo.gdml.csg.json | dot -Tpdf -o foo.pdf

[sethrj]

@elliottbiondo This one is also ready for review if you want

[elliottbiondo]

(will do today)