Simple ai shooting PoC (#23)

src/heads/mod.rs

@@ -44,7 +44,7 @@ impl HeadState {
         }
     }
 
-    fn with_ability(mut self, ability: HeadAbility) -> Self {
+    pub fn with_ability(mut self, ability: HeadAbility) -> Self {
         self.ability = ability;
         self
     }