Load the Adv state from Vm state

[DCNick3]

This seems to be called "Scene Loading" in the game

The idea is to first run a lighter version of VM, without loading assets & rendering to a specific position in the script, and then to materialize it to the "real" ADV view.

This feature is used to implement loading (definitely), rollback and save thumbnail building (maybe). Also, warping to specific point of SNR is useful for development & debugging.