Object dependency should behave like N64

[Kenix3]

BGCheck needs a higher polygon and vertex count due to removed object dependencies.
Otherwise Forest Temple checkered room will crash due to the hallway actor being killed a frame late.
This is a workaround. The proper solution to fix this crash is to manage object loading / unloading the same as N64.

See also #615

[briaguya-ai]

as per discussions around future mod support, we're moving in the direction of removing object dependency more fully than we already have instead. closing this.