Pedestrian collision scenario and WiseSim integration

[scott-larter]

Summary of changes:

• Create scenario where pedestrian dynamically adjusts speed to ensure collision with vehicle at crosswalk
• Update functions that parse the btree file to create a snapshot string
• Update .cpp files in unreal/GeoScenarioModule/ folder to add pedestrians to co-simulation with WiseSim
• Add velocity arrow to pedestrians in dashboard