pacpackages module addition

Shows upgradable packages via notify-send.
Requires `checkupgrades` which is part of `pacman-contrib` which also includes rankmirrors, pactree etc which a lot of people use i believe so adding it to LARBS dependencies wouldn't be too bad I think.

.scripts/statusbar/pacpackages

@@ -8,8 +8,11 @@
 
 case $BLOCK_BUTTON in
 	1) $TERMINAL -e popupgrade ;;
+	2) notify-send "$(/usr/bin/checkupdates)" ;;
 	3) pgrep -x dunst >/dev/null && notify-send "<b>Upgrade module:</b>
-📦: number of upgradable packages" ;;
+📦: number of upgradable packages
+- Left click to upgrade packages
+- Middle click to show upgradable packages" ;;
 esac