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Grt update fastroute layer data
Fixes #4266
This PR updates the FastRouteCore class to use the same indexing for Layers as the GlobalRoute. With this PR every layer information stored in the FastRouteCore uses an indexing starting with 1, but the vectors that have layer indexing maintain the indexing starting with 0.
clang-tidy review says "All clean, LGTM! :+1:"