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This is a code movement CL with minimal changes. Details:
- Add obj_analyzer.py: New home for BulkObjectFilenalyzer, along with
  helper functions. Also inherits main() from nm.py for testing.
- Add string_extract.py: New home for {LookupElfRodataInfo(),
  ReadFileChunks(), and ResolveStringPieces()}. Add top-level comments.
- nm.py: Have content moved to the new files. Also, exposing
  RunNmOnIntermediates(), to be called from obj_analyzer.py.
- Update archive.py and console.py to adapt to new code locations.

Bug: 723798
Change-Id: I1d1670f04549a416f06de1da03c1a2b03c378461
Reviewed-on: https://chromium-review.googlesource.com/1136943
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575062}