<Switch> component should propagate event when toggling

[tniezurawski]

Currently, <Switch> doesn't propagate event when toggling. That makes it "hard" for the consumer of this component to stop event propagation if they happen to have a nested interaction.

I think that in general, it's a good practice to push event up as the last argument so a consumer always has access to "click"/"touch"/"key*" events.

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A fix is just 3 lines of code. I'll prepare a PR when I have a bit of time.