Update to Mac build

I have removed old builds of this game now that the Syntax Bomb competition has finished and I can update it.

Patch notes are in the main description for the new Mac build but mainly it was to code sign the project and also optimise the game a bit more to remove stuff that was never used. It's also properly compiled rather than running through the code runner so users with lower spec Macs will find it runs much better.

I will update the Windows build at a later date.