Add new methods related to file downloads

[mdmintz]

Add new methods related to file downloads

self.get_downloaded_files(regex=None, browser=False)

self.get_data_from_downloaded_file(file, timeout=None, browser=False)

self.assert_data_in_downloaded_file(data, file, timeout=None, browser=False)

Note that seleniumbase tries to download files into the ./downloaded_files folder, but Safari and IE don't let you change the default downloads folder. Guest Mode on Chrome and Edge also prevent changing the default downloads folder.

[mdmintz]

This was resolved in 4.18.9 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.18.9