Oak v4.0.0 alpha 1

This release is a first alpha for Oak v4; this release primarily targets the event API, overhauling it to reduce its exposed size, improve efficiency and add type safety with parameterized types.

Oak v4 currently is planned to overhaul event, audio, internal drivers, and x/entities.

What's Changed

• scene: Embed Eventhandler to allow for some embedded calls by @Implausiblyfun in #197
• Feature/v4 eventskeys+examples by @Implausiblyfun in #199
• event: overhaul api by @200sc in #196

Full Changelog: v3.4.0...v4.0.0-alpha.1