in-game gaf animations may be out of sync by one frame

[MHeasell]

I recently converted RWE from a 60fps sim to a 30fps sim and implemented interpolation between the previous sim state and the current sim state for most things.

However gaf animations are still keyed of the current sim time, and don't respect interpolation.

This means that gaf animations can be up to 1/30th of a second ahead of where they are meant to be.

This issue is about fixing that.