sh: Add clear and rerun function

Added simple function to clear the screen but additionally re-run the
last executed command.

Mirroring my clear screen alias `cl`, this one is executed with `cll`
(clear-and-last) currently.

It comes in useful for me every now and again because I sometimes just
need a quick way to get rid of 'clutter' on my terminal (e.g. running
multiple rg invocations after each other, or diffs, or anything that
spews a bunch of stuff on screen and I want to find specific things
afterwards).
I am very used to running `cl` and then the second to last history item.
This makes those additional keystrokes unnecessary.

sh/.config/sh/alias

@@ -43,6 +43,14 @@ alias md="mkdir -p"
 
 # clear my screen
 alias cl="clear"
+# clear screen AND re-run last command
+# Is presumably not fully portable, see
+# https://overflow.hostux.net/questions/24223811/getting-last-executed-command-from-script#
+cll() {
+    lastfun="$(fc -n -l -1 -1)"
+    clear
+    eval "$lastfun"
+}
 
 # Display current external ip address
 alias myip="curl -s icanhazip.com"