Implemented a new "super knife". Activate with k. Holding CTRL
will allow extended cutting ala old lines mode. Confirm with enter
and escape. You cannot cancel, btw, you can only confirm (and undo
later if you want). Hopefully I'll support undo within the tool soon.
* Supports cutting edges, into faces, etc. You can pretty much do whatever
you want. Will snap to vertices too.
* Note that if you cut into a face, it must be valid topologically when
you press enter to confirm.
* It's pretty and graphical :)
* You can only cut visible geometry.
* UVs/vcols are a little buggy still
Now, thou shalt all cease and desist all lack of motivation for
testing! No longer shall users put off testing until "it's cooler"!
:P
