Unity Security Patch

In light of recent news of a security exploit in Unity, I have rebuilt the latest version of the Physics Update (v0.2.14) with an updated version of the Unity Editor that I'm using for this project. The demo version has also been updated.

Note that I am not able to apply updates to the "physics-update-playerprefs" or "pre-physics-update" branches. If you want to play on those historical branches of Solar Lander, then you should apply the patch that Unity has provided. But "physics-update" (non-playerprefs version), "beta-build", and "default" branches have been updated with a clean build of the game.