Webtoon-downloader

Added new positional argument (--seperate) which enables downloading chapters into seperate folders

Removed some forgotten log outputs. the terminal output should be cleaned now

The url argument is now taken as a positional argument, meaning that their is no need to specify the '--url' option anymore to provide the link.
The positional arguments are now also showcased with different colors compared to the options arguments.
These 2 colors can be changed by passing different values to the ArgumentParser constructor.

Removed unused variable and slight modification to progress bar output.

Removed some unused variable and added an additional spinner animation to the transfer speed progress bar.

The chapter downloader function has been modifed to enable nested concurency where it is now able to run multiple threads that download different chapters which all spawn their own threads for concurent download of pages.