Making VScript transition across levels

[Blixibon]

May require major refactoring of existing save/restore system.

[reductor]

I think it might be worth moving this out into post-4.0 as it requires wider refactoring and his higher risk especially when it comes to load and save.

[Blixibon]

#59 adds Save/RestoreTable functions which can allow data to save/restore across level transitions, so I'll consider this issue closed.