Add skill specialist

This came from my girlfriend who likes to go around sniping off hunters and runners without alarming any near by machines, she is good at it too. She is excited the Kotenok getting buffed a little, her weapon of choice. But she mentioned it would be great if she could use the commando skill set with the marksman skill set to be a true sniper in the game.

Her point is, she needs to have steady aim, shoot, swiftly move quietly to a new location and line up for the next attack. Which is the way snipers do it. They move before they are detected. Can’t do that very well as a marksman.