More convenient events for popular cases

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For example, desired syntax:

input(
  onChecked --> booleanEventBus,
  onChecked.preventDefault --> booleanEventBus,
  onInputString --> stringEventBus
)

Whereas currently we need incantations like this for e.g. onChecked:

input(
  inContext(thisNode => onClick.preventDefault.mapTo(thisNode.ref.checked) --> booleanEventBus)
)

Which is type safe, and fairly straightforward if you know Laminar's features, but still annoyingly long.

Not sure yet how best to implement this, current event handling is not flexible enough to easily support this, but it's also something that I've wanted to refactor for a while now. The whole EventPropTransformation / EventPropEmitter stuff can probably be done better.

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Oh and consider some syntax sugar for things like filtering events by KeyCode

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0.12.0 addresses a lot of this with mapToValue / mapToChecked, composedEvents, etc.