Fixes colorama unintentionally overriding multiple sys.stdout wrappers of our own.
And provides a fix for a SyntaxWarning on Python 3.8:
C:\Google\depot_tools\third_party\colorama\ansitowin32.py:43: SyntaxWarning: invalid escape sequence \[
  ANSI_RE = re.compile('\033\[((?:\d|;)*)([a-zA-Z])')

Tests are updated to account for the annotation wrapper no longer being overriden.
A fix by agable for the annotation wrapper working with carriage returns is also included (https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1592612).

Bug: 958138, 958321
Change-Id: I2fe1def85c66cfe5229a1c25c2f677e498593eea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1591513Reviewed-by: Aaron Gable <agable@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Raul Tambre <raul@tambre.ee>
Auto-Submit: Raul Tambre <raul@tambre.ee>