Event names too restrictive

[erikdahlstrom]

https://github.com/ericwilligers/svg-animation/blob/master/smil-in-javascript.js#L59 lists a bunch of event names. For all intents the SMIL syntax is meant to support any and all event types that a UA supports, so the restricted set here doesn't make sense (ideally it should match against supported event types in the UA, but failing that it's still better to just register event listeners for all found event names).

Also, note that some of the event names have been changed in svg2, dropping the "SVG" prefix on a few of these events, e.g it's 'load' instead of 'SVGLoad'.