On

Improves events with multiple registration, retrievable listeners, easier removal, and single run support.

Usage:

target.on("event", function(event) { })
target.listeners.event[0](new Event("event"))
target.listeners.event[0].remove()
target.on("event", function(event) { }).remove()
target.on([ "event1", "event2" ], function(event) { })
target.on("event", { once: true }, function(event) { })
target.on("event", { once: true }).then(function(event) { })

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