[TRACKING ISSUE] The return of flight!

[samsartor]

When we left off, flight had just survived a semester of urgent hacking. Awake again, can flight survive in the new world of gfx-hal, pathfinder, and immediate-mode nphysics?

• Identify MVP.
• Triage old issues.
• Use rendy.
• Integrate nphysics.
• MVP UI system.

[rdmerillat]

I'd love to help out too, we should get the gang back together ;)