async_update_prompt and async_alert do not respect the allow_style settable

[tleonhardt]

The async_update_prompt and async_alert methods within cmd2.Cmd do not respect the allow_style settable.

If allow_style is set to NEVER, then ANSI escape codes should be stripped before outputting using these methods as well.

[github-actions]

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[github-actions]

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[tleonhardt]

This is fixed in version 3.2.1 which was released today.