xbindkeysrc: yakuake

(Hint, with suckless, yakuake is very simple!)
pkgs/st: update
bin: some helper scripts

pwerdown is a customized version of the Arch package of the same name.
dvtm-scrollback is a dvtm with no FIFO
set_trackpoint writes to the correct /sys/ entry to tweak the trackpoint
bin/status-line: list current tasks