zsh/highlighting.sh: remove annoyning underline from "sudo"
weechat/{plugins.conf,weechat.conf}: tweak some colours
xinitrc: add "sylpheed" and "gnucash" to autoload
subtle.rb: configure sylpheed and gnucash windows
weechat/{plugins.conf,weechat.conf}: readjust colours again
zsh/bindkeys.sh: add a bunch of useful shortcuts
weechat/plugins.conf: update the colour