Every event should be of type TypedTargetEvent

[cornerman]

Currently, only a handful of the event properties are defined as a TypedTargetEvent, some are plain dom.Event. For convenience, it would be good if we could assume this for every event, i.e., every event is at least a TypedTargetEvent[dom.EventTarget].

[raquo]

But dom.Event from scala-js-dom already has target typed as dom.EventTarget, no need for TypedTargetEvent[dom.EventTarget]. Or did you mean something else?

[cornerman]

My use-case was that I wanted my EventPropBuilder to produce events of type TypedTargetEvent[_ <: dom.EventTarget]. But actually, I do not really need it anymore, so I can think we can close it again :)