-Fixed an issue with newly created OBJ files not loading properly
-Added button to toggle shadows
-Added a simple crosshair "grid" and a toggle to turn it on and off.
-You can no longer edit an edge if your cursor is over the UI
-You can now use numbers 1 - 5 to switch between different edge type modes.
-You now use CTRL + Left Click, instead of Right click, to paint the opposite edge type. This is to prevent accidently editing while moving the camera