Tweaks to physics, UI, and settings. — Tire Friend Steam update #145254

Exciting stuff here: some things are very slightly different! Among other things: Screen resolution options are more straightforward. Hopefully, it all still works! (I do need to fix how UI scaling changes with window size and screen resolution, though.) All of the Options tabs (aside from Data and, of course, Steam Feedback) have a button to restore defaults. There should be a lot fewer reading/writing to save/settings files. Which should speed up loading times, especially on lower-end machines. Tire Friend himself has a couple of visual indicators for some of the difficulty options (Panic/Leak/Challenge Mode, Tire "Physics" Mode, and air leak rate) in the hub world. May need to make these more obvious. Tire Friend jumps a little bit higher. Some levels have been tweaked. In one level, I shoehorned in some Ring Lasers because they work better than rotating burners. Some more level stats...