https://bbs.archlinux.org/viewtopic.php?id=164108
http://510x.se/notes/posts/Configuring_and_using_rxvt-unicode/
https://gist.github.com/xkr47/98224ed6b0860cb55ec0
xrdb ~/.Xresources
https://unix.stackexchange.com/questions/294337/rebinding-ctrl-alt-cv-to-ctrl-shift-cv-in-urxvt-9-20