If enabled, it makes knife project act as the
cut-through (Shift-K) version of knife.
This option will soon be more useful when a better
cut-though Knife change is submitted, allowing
this to work for cuts within faces in addition
to cuts across them.
- when running knife project, disable vertex selection since it may select areas between the newly cut regions.
add EDBM_selectmode_disable() function since loopcut does this too.
- (optimization) avoid looping over all geometry when flushing and no selection exists.