Build script broken

[jcmoyer]

It's not ideal when you have to remember how to package your game manually because your build script broke in the last 5 minutes before LD submission closes.

Build script needs to be able to handle asset subdirectories.

[jcmoyer]

The best way to solve this is probably moving the asset list out of main.ts into its own file that the build script can process, this avoids hacks like filtering on file extensions and ensures (assuming the resource list is properly maintained) unused assets are never distributed.