Top-level disable not-saving-small

I think it’s time for the option to ever NOT use SaveSmall to just go away, just take the box away. I try to always use SaveSmall but the blasted meshes will sneak in there on an export or a saveas or incrementalsave. I don’t think it’s something I’ve ever actually wanted to use in the last…decade? even on projects with the most obnoxiously long mesh generation times. Even with SSDs loading times matter…and WITH SSDs file sizes matter more.