[mangafire.to] Please add command for downloading only official/unofficial chapters

• Problem: Some mangas in this website have 2 different versions of manga (within the same language): the official and unofficial. They're the same chapters, but with different qualities and translations. If I use gallery-dl to download them, it'll download both version, unless I go through every page in the website and collect links of each chapter for individual download.

• Examples [you can identify the official version with the green check mark besides the chapter number] :

1. Gantz: https://mangafire.to/title/qz6vv-a-returners-magic-should-be-special

1. A Returner's Magic Should Be Special: https://mangafire.to/title/qz6vv-a-returners-magic-should-be-special

• Solution: an specific command where you can specify if you want to download only the official version, or the unofficial version.

Thank you for the wonderful project!