LongShot for long screenshot

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- Add option to also saving original screenshots.
- IMPORTANT: Due to too many questions about blurred screenshots after sharing, even though I've explained in description and added a dialog before first sharing: that is due to some IM apps' compression. The default result screenshot shortcut option has change to "Browse". It can be changed back to "Share" in Settings. Sorry for the inconvenient. I'm really tired of all those reviews.
- Improve Polish translation.