Add mass-updater script.

packages/usb/update-loop-getkey.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+firmwarePath=$1
+
+while true; do
+    read -n 1 char
+    if [[ $char == "a" ]]; then
+        ./flash update-firmwares-and-configs.js "$firmwarePath" ansi
+    elif [[ $char == "i" ]]; then
+        ./flash update-firmwares-and-configs.js "$firmwarePath" iso
+    fi
+done