Implement the ability for Signal Event Listeners to attach to multiple Events.

[trq]

So, instead of simply listening to one event:

<?php

(new Manager)->attach([
    'name'      => 'some-event',
    'callback'  => function($e) {}
]);

we could attache to multiple:

<?php

(new Manager)->attach([
    'name'      => ['some-event', 'some-other-event'],
    'callback'  => function($e) {}
]);

and from here, it would also maybe be nice to implement an all:

<?php

(new Manager)->attach([
    'name'      => '*',
    'callback'  => function($e) {}
]);

[trq]

Another option might also be to be able to attach to an event by a pattern. eg;

<?php

(new Manager)->attach([
    'name'      => 'pre.in.*',
    'callback'  => function($e) {}
]);

[trq]

Closed by 98047dd & 6fb92c1

The pattern matching proposal is going to be far too inefficient IMO.