YMAP Grass Bitset Converter

Replaces the broken <Bitset> blocks written by the export with the ones from the original. Everything runs locally in your browser.

Matching: primarily by order (identical batch count + archetypes), otherwise by fingerprint (archetype + instance count + positions). A bitset is only transferred when both batches' GridSizeX/Y and RowSpan match — otherwise it's skipped (warning). The rest of the file stays unchanged.