Add Multi-Segment Measurement to 3D Maps in the Measure Widget

[Yanin]

In 2D maps, the Measure widget lets users measure multiple segments by clicking through multiple points. But in 3D maps, it only allows measuring between two points. It would be useful if the 3D Measure widget could support multi-segment measurements like in 2D.

This would make it easier to measure complex paths and keep the tools consistent between 2D and 3D maps.

[ClintOffutt]

It would be nice if the 2D measure tool could log or label each individual segment of a multi segment measurement!