Pass event object to custom event handlers

[agrif]

Followup to Issue #44.

A quick guide to changes:

• Added "Event" feature to web-sys dependencies for virtual-dom-rs and and virtual-node.
• Modified CustomEvents and the html! macro to accept FnMut(Event) -> ().
• Copy/pasted the oninput test, but this time using the generic handler syntax.
• Changed all the examples I could find to accept an event object (named _ev, usually). I may have missed some.

I didn't touch the versions, though this is a breaking change. I dunno how you handle that.

Something I didn't anticipate: even without casting the Event to something more specific, this gives the handler immediate access to the element it's tied to, which is a pretty big win by itself.

[vercel]

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[chinedufn]

Awesome!!!!! So a huge win. I'm almost thinking that we should favor this over adding all of the other events in.. Can't think of a reason that we wouldn't just recommend that people do their events this way.

[chinedufn]

I'll get this merged and deployed later tonight.

To answer your question above -> Until we hit 1.0 we're making breaking changes as minor bumps.

[chinedufn]

Published as virtual-dom-rs v0.4.0

[agrif]

Awesome.

I'll go and update my stuff!