Add a method for converting a source URL into a profile URL. This will be used for normalizing profile URLs in artist entries. Also add the ability to parse a few more profile URL formats.
These comments are already present under the parse blocks, so the huge walls of text before the code are not needed anymore.
Also fix it so that we grab the full image for cover URLs like this: * Sample: https://pixiv.pximg.net/c/1620x580_90_a2_g5/fanbox/public/images/creator/1566167/cover/QqxYtuWdy4XWQx1ZLIqr4wvA.jpeg * Full: https://pixiv.pximg.net/fanbox/public/images/creator/1566167/cover/QqxYtuWdy4XWQx1ZLIqr4wvA.jpeg