Post Jam Feedback Update

This is a quick patch to address the glaring issues discovered during the judging for GMTK 2025.  Specifically:

- The per-lap acceleration/deceleration for the first couple levels has been scaled down dramatically (from 0.12 to 0.01), and the gap between the starting line and where cars spawn has been increased a little bit.

- The camera no longer rotates to follow the car.  The tradeoff is that controls are less intuitive since you are now driving it like an RC car, but there should be no more complaints of motion sickness.

- Threading has been enabled for the web export, which should fix some of the audio issues.  I noticed there is still a brief lag spike when the music first starts up, but other than that, it seems to work better now.