[x-license] Use a simpler checksum for the license key

[oliviertassinari]

Summary 💡

Using md5 to perform a checksum on the license key feels overkill.

Examples 🌈

Out of this license key:
61628ce74db2c1b62783a6d438593bc5Tz1NVUktRG9jLEU9MTY4MzQ0NzgyMTI4NCxTPXByZW1pdW0sTE09c3Vic2NyaXB0aW9uLEtWPTI=

we have 61628ce74db2c1b62783a6d438593bc5 that is the md5 checksum.

We could replace this with a simpler version:

function hashCode(string){
  return string.split("").reduce(function(a,b){a=((a<<5)-a)+b.charCodeAt(0);return a&a},0);              
}

(source) which would turn the license key into:
728701898Tz1NVUktRG9jLEU9MTY4MzQ0NzgyMTI4NCxTPXByZW1pdW0sTE09c3Vic2NyaXB0aW9uLEtWPTI=

saving 0.5 kB gzip (from removing md5.js) and 23 characters in the license key.

Motivation 🔦

DX & UX

Order ID 💳 (optional)

No response