Format output to fit in stdout codepage. Fix #5144.

[julienlavergne]

• Do not force default encoding to utf-8 (which causes issues), but adapt the output to the current encoding.
  Messages going though the logging and color logging handler will always have an encoding supported by stdout.
• Support chcp 65001 for displaying utf-8 encoded characters in console window if system is able to display them.

[mention-bot]

@anakin5, thanks for your PR! By analyzing the annotation information on this pull request, we identified @Napator, @extink and @TheSavior to be potential reviewers

[mjmadsen]

👍

[sohje]

This commit broke event emitter. Default encoding was set to ascii instead of utf-8(sys.reload, setdefaultencoding('utf-8')), when we try to emit events with utf-8 encoded strings(unicode type). Exception is raised:

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-2: ordinal not in range(128)

[julienlavergne]

You need to give more details. The error message you have is very generic. There is no need to force the default encoding to utf-8 to not have errors with utf-8 encoded strings.
Which event raised the error ? can we have the full stack ?