Pyparam

- ✨Add _to_dict for parsed Namespace object

- Add kwargs to `to` and `copy` for Param

- Use basename in help for prog name by default
- Fix ignore_errors not ignoring the non-PyParamException errors

- Make sure switching arugments of callbacks correctly
- Only print errors with help for callbaks to return exceptions, otherwise, raise them
- Make clean logger level name

- Change help_cmd to choice

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- Don't use shared console for logging
- Allow command to be not provided.