`-o` will emit the files to the given root output directory
`--verbose` will print what's going on, to help with debugging
Omitting these flags will behave as before.
Also consolidate the utils package into fileutils. These were two packages with near identical functionality.
Change-Id: I855dd4b57807fb9239a52e7f357842d4ba2517ee
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107687
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
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