Users with Roles

Role management, made simple (?).

Motivation

I think everyone is familiar with assert(caller == owner). Yet, after a while these assertions can become somewhat complex, especially when you have a role system for administrators. I always ended up writing assertions in various projects with the same logic behind it. So, here it is, a package.

I don't know if it is of any use... but feel free to use it or even improve the code by opening a PR.