src: clean up `node::Init()` wrt embedder scenarios
This makes the STL variant of node::Init()
a bit more
suitable for inclusion in a proper embedder API, as errors
or other output are reported to the caller rather than
directly being printed, and the process is not exited
directly either.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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