Requests-downloader

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* Option to show filename to the left of progressbar
* Modularize code
* Style: Black
* Fix bugs

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* Several documentation updates
* Code refactoring
* Change console command from clunky `requests_downloader` to `smart-dl`

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* Improvements in content disposition and content length handling
* Logging improvements

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* Minor bugfixes and spelling corrections.

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* Support for Google Docs (Document, Spreadsheets, Presentations).

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* Bugfixes.
* First Alpha release.