Utils: Introduce utils and animation helpers

The next commit implements the LCD and animation support. To enable an easy
way to create animations for it, add details in the README regarding the way
the SD card is used and how the files need to be formatted.

Create the Utils directory and add a Rust project to do the bit flipping and
a script that automates all the steps described in the README.
Add a README for Utils explaining how to use them.

Utils/convertAnimGif.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if [[ $# -eq 0 ]]; then
+  echo "This script expects the name of the files to convert as arguments"
+  exit 1
+fi
+
+if [[ ! $(command -v convert) ]]; then
+  echo "Could not find 'convert' utility, cannot proceed."
+  exit 1
+fi
+
+# Get the absolute path to the source of the script
+scriptSrcDir="$(dirname -- "$0")"
+pushd "$scriptSrcDir"
+scriptSrcDir="$(pwd)"
+popd
+
+if [[ $(command -v bitmap_helper) ]]; then
+  bmp_help="$(command -v bitmap_helper)"
+elif [[ $(command -v "$scriptSrcDir"/bitmap_helper/target/debug/bitmap_helper) ]]; then
+  bmp_help="$scriptSrcDir"/bitmap_helper/target/debug/bitmap_helper
+elif [[ $(command -v "$scriptSrcDir"/bitmap_helper) ]]; then
+  bmp_help="$scriptSrcDir"/bitmap_helper
+else
+  echo "Could not find 'bitmap_helper'."
+  echo "Have you compiled it or placed it in the same directory as the script ?"
+  exit 1
+fi
+
+for gifToConvert in "$@"; do
+  if [[ -z "$(echo "$gifToConvert" | grep -e 'gif')" ]]; then
+    echo "Cannot convert $gifToConvert : not a gif."
+    continue
+  fi
+
+  animDir=ANIM_"${gifToConvert//.gif//}"
+  mkdir "$animDir"
+  pushd "$animDir"
+
+  convert -resize 84x48 -coalesce ../"$gifToConvert" -threshold 50% %02d.mono
+  "$bmp_help" ./*.mono
+  # Clean up and remove the extension
+  rm -f ./*.mono
+  for f in ./*.bin; do
+    mv "$f" "${f//.bin/}"
+  done
+
+  popd
+done