Blender Git Loki

Fix T62713: Paste Normal Vectors - needed better selection handling.

Existing code was not really handling well cases were only edges or
faces were selected (with match select modes).

In those cases, we can assume user want to only affect loop normals of
selected faces/edges, not all lnors of all (indirectly) selected verts.

Also refactored the code a bit to move whole 'loop to edit' selection
process into its own single function.