Add support for arrays and structs containing TSoftObjectPtr.

[perrauo]

Summary:

• Previously structs containing TSoftObjectPtr were not resolved correctly leading to pointer to object found in different scenes, or deleted objects.
• Builds on top of @OmikronX support for array to enable structs:
  https://github.com/OmikronX/prefabricator-ue4/tree/local-actor-references-fix

Changes:

• Look for cross references found in structs, and arrays.
• Remove check for cross reference found for default property save, in order to save struct non-object properties.
• Add support for struct and arrays when resolving object path.