started API implementation. This has the following consequences:

 - Main Classes of mods are executed, loading has to be performed there
 - Turrets are no longer auto-loaded, they have to be loaded using the mod main class and the registerTurret() method
 - LaunchOnExecute is renamed EnvironmentalWork and gets new onFinish method, however it is deactivated for the moment.

THIS UPDATE BREAKS MOD COMPATIBILITY