Rename Patreon files capture by reading html

[Ovear]

This may mitigate #181 by adding file id to filename instead of adding sequence number at the end of file.

But this change may cause the file order to be lost, which could be a workaround before we find a way to generate a stable file sequence number.

[AlexCSDev]

Thank you for your pull requests, I'm quite busy with other projects right now, I will try to review your changes as soon as possible.