A small change in the API requires `shortCircuit: true` when returning the
transformed source.
Another API change removes third argument from the chained resolve/load,
but passing three instead of two still works.
This uses `Module._resolveFilename` to intercept module resolution and
check `tsconfig.paths` similarly to pirates usage ot `Module._compile`.
Previously, we resolved during compilation that required reproducible
resolution due to caching. Now we can resolve as we go and support
all `tsconfig.paths`.
