SCREEN_CONTROL_LAST_SETTING usage

Grid was added when the foam cutter simulation was added. I am not sure what it was for but it is useful I think. I've used it in nurbs editor for reference of size.

What do you guys use the grid for?

Perspective when zoomed in, mostly. Sanity check on size, distance to move, etc.

I wouldn’t say it’s strictly necessary, but I’ve definitely gotten used to it. It’s turned on for all of my machines.