Add C++ tests for cross-platform error code checks. #10
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This adds a new Savi program to the repo, which can print a C++ program that checks the mapping of error codes by names, comparing what we have implemented to what the C++ compiler resolves.
This will let us quickly find out if any of the error codes we have defined are at variance with what a C/C++ program would see.
Note that this PR actually includes a few platform-specific error code fixes, for issues noticed by this new check, so it's already paying off.