Sticker-convert

- Support for Signal flatpak version

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**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**

- Allow uploading more than one emoji for each sticker in Signal sticker pack
- cb_ask_str always return str

---
**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**

- Allow download and upload Signal sticker pack cover
- Force recompress webp files (260)
- Update dependencies
- Install python with pyenv in docker for Linux binaries

---
**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**

- Fix cannot download Signal stickers (255)
- Update dependencies

---
**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**

- Compiling with nuitka on Linux
- Reduce Telegram upload / download rate to avoid hitting limit (247)
- Create zipfiles without creating tempdir
- Fix quantize image cause crash if quality and color is 0

---
**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**

- Allow downloading / uploading Telegram stickers using Telethon
- This allows uploading Telegram stickers with link that does not end with _by_xxxbot
- Adds CLI flag "--telethon-setup", "--download-telegram-telethon", "--export-telegram-telethon", "--export-telegram-emoji-telethon"
- Tutorial: https://github.com/laggykiller/sticker-convert/blob/master/docs/guide_telegram.md#option-2-telethon
- Improve webp compression
- Support for "sgnl://" url
- Fix "--save-cred" CLI flag, making it a bool flag
- Update dependencies

---
**Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.**

**尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！**