Add support for DurationInTraffic#157

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PeterDavidson wants to merge 5 commits intoericnewton76:masterfrom

PeterDavidson:master

Commits on Apr 9, 2019

Commits on Dec 10, 2019

Added in TrafficModel to allow pessimistic and optimistic times to be requested, and also updated to the latest Newtonsoft.Json
Peter Davidson
committed

Commits on Apr 17, 2020

Modify the project to remove Net Framework 461 support and move to Net Standard 2.0 (since it was causing build errors).
Peter Davidson
committed

Commits on Sep 14, 2023

Removed some unused using statements
PeterDavidson
committed