The Unicode box drawing turn out malformed on Windows (even with
fix_encoding.py). This CL refactors the box drawing code, and makes
Windows box drawing use regular ASCII characters. Details:
* Add print_red_boxed_text() to programatically print box aroun given
  list og strings.
  * Unicode box drawing characters are escaped, removing the use of
    non-ASCII characters in source code.
* Convert message source to generators for greater flexibilty, and
  remove the need for manual horizontal padding.
* Add proper use colorama with Style.BRIGNT and Style.RESET_ALL.
* For Windows, revert to ASCII characters for box drawing.

Change-Id: I71a728db480709b4376d538aaecd701f9197e7ac
Reviewed-on: https://chromium-review.googlesource.com/c/1461249
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>