Add Ability to Measure Properties of Geometry/Topology

This requires selection of vertices, edges and faces to be working first.

Possible Workflows

Select edge directly to get curve length, and maybe start and end vertex vectors.
Select two vertices to get the curve length between them, and maybe the start and end vertex vectors.
Select a vertex to get its location vector.
Select a face to get its area, and possible edge and vertex info as well.
Multi-selection of faces could maybe give a combined area.
Select a component to give volume, and maybe face, edge and vertex info.