Fix several bugs in punctuation and capitalization inference and make minor improvements
1. A parameter `--input_text` of the script `punctuate_capitalize_infer.py` was not working because of wrong implementation of data reading. Fixed.
2. Add parameter `--save_labels_instead_of_text` to script `punctuate_capitalize_infer.py` and parameter `return_labels` to `PunctuationCapitalizationModel.add_punctuation_capitalization` method. Useful feature in my opinion.
3. Remove device choice from `PunctuationCapitalizationModel.add_punctuation_capitalization` method. Device choice should be done in `main` function.
4. Add parameter `--device` to the script `punctuate_capitalize_infer.py`.