Remove testing/debug options and simplify parameter handling

* Also let external app close cookie prompt when a pipe is provided
  and use a more explicit Continue/Back scheme for button labels.
* Also add signature script

sign.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# This script creates the RSA-2048 signatures for our downloadable content
+
+PRIVATE_KEY=/d/Secured/Akeo/Rufus/private.pem
+PUBLIC_KEY=/d/Secured/Akeo/Rufus/public.pem
+
+# Create or update a signature
+sign_file() {
+  if [ -f $FILE.sig ]; then
+    SIZE=$(stat -c%s $FILE.sig)
+    openssl dgst -sha256 -verify $PUBLIC_KEY -signature $FILE.sig $FILE >/dev/null 2>&1
+    if [ ! $? -eq 0 ]; then
+      echo Updating signature for $FILE
+      openssl dgst -sha256 -sign $PRIVATE_KEY -passin pass:$PASSWORD -out $FILE.sig $FILE
+    fi
+  else
+    # No signature => create a new one
+    echo Creating signature for $FILE
+    openssl dgst -sha256 -sign $PRIVATE_KEY -passin pass:$PASSWORD -out $FILE.sig $FILE
+  fi
+}
+
+read -s -p "Enter pass phrase for `realpath $PRIVATE_KEY`: " PASSWORD
+echo
+# Confirm that the pass phrase is valid by trying to sign a dummy file
+openssl dgst -sha256 -sign $PRIVATE_KEY -passin pass:$PASSWORD $PUBLIC_KEY >/dev/null 2>&1 || { echo Invalid pass phrase; exit 1; }
+
+find . -maxdepth 1 -name "*.ps1" | while read FILE; do sign_file; done
+# Clear the PASSWORD variable just in case
+PASSWORD=`head -c 50 /dev/random | base64`