Function tx_custom_boot::generate_boot_dat

pub fn generate_boot_dat(payload: &[u8]) -> Result<Vec<u8>, Error>

generate a boot.dat given a payload from https://gist.github.com/CTCaer/13c02c05daec9e674ba00ce5ac35f5be but revisited to match https://sx-boot-dat-creator.herokuapp.com/ which works for me payload is a byte array of the payload