Add code to make knife cut through whole mesh optionally.

Notes:
- only cuts through when the occlude geometry button is unpushed,
  else the old behavior
- doesn't add points in middle of occluded faces yet, so will not
  make partial cuts or hole cuts in occluded faces; for best
  results, start and finish cuts completely outside the mesh
- also made slight improvement to behavior when starting cut
  off the model
- a small refactor: added knife_add_to_vert_edges for code
  used a number of times

0 files changed, 0 insertions, 0 deletions