Add sc-launch as a shortcut for start & enable

I've heard many people requesting systemd to add this functionality. It's very handy under Arch.

plugins/systemd/systemd.plugin.zsh

@@ -9,3 +9,4 @@ sudo_commands=(
 
 for c in $user_commands; do; alias sc-$c="systemctl $c"; done
 for c in $sudo_commands; do; alias sc-$c="sudo systemctl $c"; done
+alias sc-launch="sudo systemctl start $c && sudo systemctl enable $c"