Boot9strap with BAX patch, version 1.4

This release is inspired by @MechanicalDragon0687's work, except that it has been updated to B9S 1.4 which is way more lightweight.

This release removes support for the bootonce.firm mechanism, due to B9S's new FatFS requirements. It could still easily be implemented by making the necessary changes in /stage2/arm9/source/fatfs/ffconf.h to allow f_unlink() and adding the missing piece of code to make it work, but it would add a significant weight to B9S and could lead to future obstacles to keep this patch up-to-date with the latest B9S releases, which does not make worth it for my own use (this release).

This patch is designed to be used with BAX: If sd:/bax.firm is available, B9S will boot it and if not, it will default to sd:/boot.firm.

The provided BAX.firm file in the release and repository has been modified to load sd:/boot.firm after playing the bax file (in contrast with the original BAX.firm which loads sd:/bax/boot.firm). This allows to benefit from the latest improvements from B9S, and to continuously update Luma3DS (or any sd:/boot.firm) using the Universal Updater without ever having to think of moving files around to keep your BAX animation working.

To install on a 3DS:

• Copy the two files (boot9strap.firm and boot9strap.firm.sha) from the boot9strap-1.4.zip archive to sd:/boot9strap/
• Copy the SafeB9SInstaller.firm file to sd:/luma/payloads/
• Optional: Copy the BAX.firm to sd:/
• Optional: Copy your BAX videos to sd:/bax/ (tools for video conversion available here)
• Boot your 3DS and hold START, if promoted select SafeB9SInstaller and follow the instructions on screen
• Optional: if you have Godmode9 installed, you must have been prompted to select between SafeB9SInstaller and Godmode9 in the previous step. Once you are done with the installation, you can access Godmode9, press the Home button, access Scripts, GM9Megascript, then scripts from the Plailect's guide, and finally Clean SD card. This will remove the boot9strap setup folder. You can then manually remove the SafeB9SInstaller from your SD card in sd:/luma/payloads either directly using Godmode9, or using your ordinary file transfer method.

IMPORTANT REMINDER: The provided BAX.firm will expect the boot.firm in sd:/, as that is intentionally why it has been created. If you prefer the original way, you need to download the original BAX.firm here and move the boot.firm in your SD card to sd:/bax/.