This adds a few more configuration options for a more flexible access
tag handling:
accessTags -
replaces accessTag and is an ordered list of access tags to take into
account. The first tag in the list found will determine the access.
This allows to model OSM's access hierarchy where a more specific
access tag might override a more general one.
accessForbiddenKeys -
unordered list of values that disallow access (similar to
accessRestrictionKeys). Replaces hardcoded values in extractor.
accessForbiddenDefault -
unordered list of highway types where access is forbidden unless an
explicit positiv access tag is given. Replaces the current track
hack.
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