INFRA: Open Sewer, Valta and Whiprock DLC announced

Valta: https://loisteinteractive.com/Loisteinteractive/Loiste_entertainment_blog.html#24-04-2018_3 Open Sewer: https://loisteinteractive.com/Loisteinteractive/Loiste_entertainment_blog.html#24-04-2018_2 Whiprock DLC: ht…