Face paths including triangle-fans would often be avoided because
the face center and edge would 'zig-zag'.
Resolve using wighted face center and picking an edge-point between face centers.
- Ctrl+RMB only worked for edges & faces
- Menu item 'Select Shortest Path' only worked for vertices.
Now Ctrl+RMB works for vertices and the menu item works for verts/edges/faces (depending on the current selection).
