feat: add pause, unpause, show, hide events & hook it into broadphase

[dragoncoder047]

Please describe what issue(s) this PR fixes.

closes #844 mostly.

• Adds onPause, onUnpause, onHide, onUnhide
• renames onResize for good measure too
• hooks the broadphase to add and remove objects when they're paused or unpaused, rather than just always skipping them (the performance impact should be negligible since it's just strange to be spam unpausing and repausing objects every frame)

Summary

• Changeloged

[imaginarny]

Isn't the resize observer observing canvas? So if you have own canvas with dimensions set on page, it wouldn't trigger onTabResize even if window is resized until the canvas itself gets resized as well - which would be then misleading. Shouldn't it be kept as onResize then?

By default canvas is set to window viewport dimensions and is mostly used like that, but it's not the only way, if true.