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Grt update fastroute layer idx
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, and also vectors that have layer indexing are changed to be used with an indexing starting with 1.
clang-tidy review says "All clean, LGTM! :+1:"
clang-tidy review says "All clean, LGTM! :+1:"
clang-tidy review says "All clean, LGTM! :+1:"