Revert "Revert "Exit button""

This reverts commit 453bab9305c2710a91cd2a5593acc07991972b48.
Revert "Revert "Nothing spawns if a ship is in the spawning zone""

This reverts commit 04d7a1738803566fb9dd760d711278690edf49a0.
Revert "Revert "Scaffolding for the bouncing is set up""

This reverts commit 67e799288addbd41a0f9c7e35ae39d27deb24539.