Press G to rotate fullscreen comics
Adds a fullscreen button to nhentai's comics reader that lets you fullscreen the comic, with the ability to rotate.
Mac users may need to install Symbola (link to fontlibrary.org) to have the fullscreen icon ("⛶") show.
I couldn't use F to fullscreen as that's already taken by a switch to go between fit horizontally and fit both. I think I've got it working pretty well, if the comic looks weird in fullscreen, press F. I set a cookie with your last rotation in fullscreen.
