GitLab

* optparse -> argparse
* Removes proguard_util.py by inlining relevant logic
* Ensures all outputs are written to temporary files,
  and then moved into place upon success
* Fixes --proguard-config-exclusions not being applied
  for R8.
* Fixes -assumevalues sdkint expression for non-R8
  (it failed for -assumenosideeffects).
* Unifies output hiding logic for R8/ProGuard
* Makes --expected-configs-file work for non-R8 mode
  * And runs it before the proguard step for faster feedback.
* Removes ProGuard-only --apply-mapping logic of stripping
  methods (no longer relevant).

Change-Id: I91aa80a52afbba674b4bbc10f41f7470142daa7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752842
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687401}