Ability to migrate items and vehiclepart-type items separately

[Soup-de-Loop]

Is your feature request related to a problem? Please describe.

When trying to rework blazemod and migrate it, I noticed that a lot of the weapon turret vehicleparts have the exact same id as the items that are used to build them. Additionally, blazemod even has internal references like this, such as the turretframe vehiclepart item and the turretframe vehicle part on a vehicle. More discriminating migration code may help alleviate glued-together code like this in the future.

Describe the solution you'd like

Separate json lines to be able to migrate an item that is just an item, and an item that is also a vehicle part. CDDA is able to tell them apart ingame, but the tools we have on hand don't seem to be capable of disentangling id's this way yet.

Describe alternatives you've considered

Abandoning any code that performs this sin in the mainline or out.

Additional context

Example:

  {
    "id": "fn_fal",
    "copy-from": "turret_blaze",
    "type": "vehicle_part",
    "name": "FN FAL turret",
    "item": "fn_fal",
    "breaks_into": [ { "item": "fn_fal", "count": [ 0, 1 ] } ],
    "requirements": { "install": { "skills": [ [ "mechanics", 3 ] ] }, "removal": { "skills": [ [ "mechanics", 1 ] ] } }
  }

vs

  {
    "id": "fn_fal",
    "copy-from": "rifle_auto",
    "looks_like": "ar15",
    "type": "GUN",
    "name": "FN FAL",
    "name_plural": "FN FAL",
    "description": "Originally designed during the Cold War, the FN FAL is probably the most successful battle rifle ever designed.  Even though often labeled as obsolete, its high rate of fire and powerful ammunition make it perfectly capable of holding its ground against modern competitors.",
    "weight": "4250 g",
    "volume": "2 L",
    "price": 350000,
    "to_hit": -1,
    "bashing": 12,
    "material": [ "steel", "wood" ],
    "symbol": "(",
    "color": "dark_gray",
    "ammo": "308",
    "ranged_damage": -1,
    "dispersion": 150,
    "durability": 8,
    "min_cycle_recoil": 2700,
    "modes": [ [ "DEFAULT", "semi-auto", 1 ], [ "AUTO", "auto", 4 ] ],
    "barrel_length": 2,
    "magazines": [ [ "308", [ "falmag", "falbigmag", "fal_makeshiftmag" ] ] ]
  }

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