Switch to the new branch
As already discussed and agreed upon, we're switching to the firmware updater fork I've prepared.
In addition to containing the updated trackpad firmware, my branch improves the messages produced during the update process, improves the handling of command-line arguments, adds the ability for the users to cancel each update step, displays end-user warnings, improves the documentation, etc.
I've also prepared the PKGBUILD.patch file.