Include User-ID in login confirmation

[Felk]

The current login confirmation event looks like this:

{
    "type": "login",
    "login": true,
    "name": "Felk"
}

It should use the user-ID instead of (or additionally to) the user name, as that's the more natural identifier

[Felk]

Or just return the full user object:

{
    "type": "login",
    "login": true,
    "user": {
        "id": 1,
        "username": "Felk",
        "connected": true,
        ...
    }
}