Support boolean logic for multiple fields

[Anton O.]

#4 is enough for simple cases of comparison related for a single field, but in case we need to interact with multiple fields, it's not enough.

For example, we want to hide password field, when firstName is missing or nickName is admin.
We can express this like this:

let rules = {
    password: {
        action: "remove",
        when: { "or" : [ { firstName: "empty"} , { nickName: "admin" } ] },
    }
}