The importers previously refused to touch an already-imported component by
design, which meant re-importing an updated UltraLibrarian/SnapEDA zip for
the same part-number errored out. Add --update to import_component.py's
import_symbol/import_footprint (and thread it through import_snapeda.py and
import_ultralibrarian.py) so an existing symbol/footprint can be replaced
in place instead, with the manifest recording it as UPDATED rather than NEW.
Used it to refresh XTAC5212IRGER from a newer UltraLibrarian download
(single-unit symbol layout vs. the previous split power/signal units;
same 29 pins).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
micheleandClaude Sonnet 5
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