Besides the NodeTree case (which remains unchanged), the localize code is only used in one place (to generate previews of shading data-blocks). This commit introduces a new `LIB_ID_CREATE_LOCAL` option for ID creation/copying, which essentially implements the behavior of the removed `BKE_XXX_localize()` functions into regular mainstream ID copy code. When this option is set: - new ID is tagged with `LIB_TAG_LOCALIZED`; - Some ID copying callbacks have specific behaviors, mainly the root nodetree of shading IDs gets duplicated with specialized `ntreeLocalize()` function. Note that I would not consider getting rid of `ntreeLocalize` for now, this function is recursive, which should ideally never happen within ID management copying code (this introduces all kind of complications). No behavioral change expected from this commit.
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