Oak v4.0.0 alpha 2

This release is a second alpha for Oak v4; this release overhauls the main package, ranges and spans of numbers and points, audio, internal drivers, screen shaking, and the entities package. It also changes from oak/v3 to oak/v4.

What's Changed

• Feature/v4 shaker+examples by @Implausiblyfun in #202
• shiny: overhaul api for v4 by @200sc in #198
• audio: overhaul api for v4 by @200sc in #201
• Feature/v4 entities by @200sc in #203
• Doc + refactor pass 1 by @200sc in #204

Full Changelog: v4.0.0-alpha.1...v4.0.0-alpha.2