Generally this change proves that we probably don't need the MPCarrier model on the target system - because by using the fallback model to load the Nasal this will happen without needing the high detail models at all.
To support this :
- Added fallback models for all carriers (defined as AI scenarios)
- Added logic to fallback models so that MP carriers load correctly
- The model will still be the AI model.
- MPCarriers.nas from MPCarrier/systems now in Aircraft/Generic
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