Schematician's Goggles

This mod adds **Schematician's Goggles**, building off of Aviator's Goggles.  While **Schematician's Goggles** are equipped: - The world becomes a Contraption Diagram. - Looking at any sublevel shows its **center of mass** and live **force vectors** (lift, drag, thrust, gravity, etc.). - The Aviator Goggle HUD (stress, burner output, etc.) is preserved. - The schematic view can be toggled with keybinds or by right-clicking with the item in-hand. The recipe is simple enough, just an iteration on the Aviator's Goggles.