fix: external inlinks for LTZ policy #295
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The LTZ policy currently can have certain edge cases where agents do traverse the Limited Traffic Zone, although they don't perform a stop inside. This happens if their origin is a link that is outside of the ZTL, but it leads to a node that has only outlinks that are inside the ZTL (i.e. their endpoint is inside). In that case the trip should perform a detour around the ZTL (and the agent will try to exit as quickly as possible due to the routing penalty), but the route will indeed pass through the ZTL for a small number of links.
This PR fixes the problem by first identifying all links that are inside the ZTL and then also including links that lead to intersections that don't have another exit than into the ZTL. The links are identified in a round-based approach.