Take mountainous terrain into account

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/take-mountainous-terrain-into-account/
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When calculating a route through hill/mountain terrain it would be nice to see that included in the calculation. Not all trips have flat landscapes and hills/mountains have a huge impact on the range