T3055
`ecashaddrjs` returns the hash of an address (aka hash160) as a uint8array. This is used in zero apps in the monorepo: Cashtab, alias-server, and ecash-telegram-bot all need special util functions to convert this to a string (since this is the format needed by chronik).
So that backward compatibility is not impacted, returning hash160 as a string from `cashaddr.decode` is a user-specified parameter that defaults to returning the old data.