Nuclear Artillery Shell - Tweaks

Changes the recipe of the Nuclear Artillery Shell from the mod of the same name by Aephiex. The original NAS mod recipe seems to reflect how ammo is crafting into uranium variants in base game, however this mod changes it to be more like an actual Atomic Bomb built into an artillery shell, with the bomb the original payload of 4 explosive cannon shells. Also adds production science packs to the research of it. Is it generally more expensive? Yes. Does it still go big kaboom? You bet ya.