Upgrade to bevy 0.14.0

Here are the changes that were required for the 0.14.0 https://bevyengine.org/learn/migration-guides/0-13-to-0-14/#make-appexit-more-specific-about-exit-reason https://bevyengine.org/learn/migration-guides/0-13-to-0-14/#overhaul-color https://bevyengine.org/learn/migration-guides/0-13-to-0-14/#moves-intern-and-label-modules-into-bevy-ecs https://bevyengine.org/learn/migration-guides/0-13-to-0-14/#improve-tracing-layer-customization The only change I'm skeptical of is the AppExit::Success. Now that I'm looking at it, I'm guessing the logic is saying, we should never hit that condition and thus we're gonna hard exit. So it'd be an error --- More importantly, I've removed bevy-scene-hook as a dependency. I haven't seen the contributor active in a while and the code to replace it was small enough with the new native observer APIs.