osx: turned the eternity project into a simple executable generator. Made the thing work again so i can upload stuff. Removed 64-bit support from Eternity Engine because it was causing hundreds of 64-to-32 implicit cast warnings, which means that the original project wasn't tested on 64-bit much.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2771 86ba831e-150c-0410-ab35-e06eaae15ed9