v1.3 - Output Directory flag

Happy Christmas all! 🎄

For this tiny release, I've added a new flag --output -o. You use it like this: 4scraper.exe -o=custom/download/dir [url] This will download all files from the provided url and put them in your custom directory instead of the default one. Note that this will ignore the BoardDir and ThreadDir settings if you have them set in config.

Also fixed an issue where custom filenames (either because UseOriginalFilename is set to false or if there's an existing file with the same filename in the target directory) were getting an extra . before the extension.

Finally, there was some sanitization issues with the filenames when using 4chan's original filenames, and that should be fixed now.