[2.0.22] Railgun damage doesn't take cryogenic science

[Nemoricus]

It's odd that the science pack used to unlock this weapon isn't used to upgrade it. Artillery uses metallurgic science for upgrades, tesla turrets use electromagnetic science, and rockets use agricultural science. Railguns are the odd one out in that their damage upgrade doesn't use the science pack used to unlock the weapon.

Also, the shooting speed research *does* use the cryogenic science pack, so it's doubly odd.

[Theragus]

Hi, the upgrade techs for railguns are split in that you need Metallurgic and Agriculture for Railgun damage upgrades and Cryogenic and EM Science for Railgun Shooting speed upgrades.
It's a little odd but that way you can improve your railguns even if you do not have fully automated all the sciences up to this point.