Blender Git Loki

- Made embbed point rely on last embbed preview (when holding down shift and moving mouse around) for finding the proper depth. This makes it much easier to do polylines on partially occluded areas: just shift-hover a visible section than move to where you want along the volume before clicking to place a point (this sounds complicated but it isn't).

- Replace Cutout command by Straighten. Fonctionnality is the same except that it now keeps points in between cuts, just straightens them.