Automatic MOI generation

[Baezon]

When a bare .dae or .obj file is opened that does not already have some metadata for moment of inertia is loaded, MOI should be automatically generated then and there, just like mass is. The lack of this has been the cause of many errors and hair-pulling.

Additionally the "Are you sure you want to regen? I'm bad at it" prompt should be removed. Literally no one is doing the manual calculations, so you're the best we have shut up