Revert "added empty file so greenfoot recognizes project"

This reverts commit abf1493fc0b84e8113e9bedb557c219f6847b3a1.
Revert my try to get the project to build without the user having to create a project.greenfoot file manually

This reverts commit 5a4db9210d57471cf87e3145d5e9f6f168bb4d89.