Added the unique skill "Vigilant Stance"

The unique skill "Vigilant Stance" has been added to Patricia. Holders of this skill will increase Avo when under attack.

I gave Patricia a dodge skill because she was originally not a playable unit, which means she dodges her role. This skill is not as dramatically powerful as Halvan's Pursuit Crit. It also doesn't work well with the Ambush skill she has. I made her skill modestly effective because people say Halvan's sister is better than him and he should die on purpose.