[Suggestion] Run VMs once before adding conditionalDefaultParts

[DrprofLuigi]

Here is the section

Running VMs before adding conditionalDefaultParts will allow for more advanced default part placement, rather than only relying on constants.

[DonBruce64]

Test and PR if you think it's a good idea. Just be aware it might cause crashes and stuff since a good number of VMs check values in the world, and don't therefore know said values until the parts are on the vehicle.