Turret pattern rewrite

core/src/mindustry/entities/pattern/ShootBarrel.java

@@ -0,0 +1,16 @@
+package mindustry.entities.pattern;
+
+public class ShootBarrel extends ShootPattern{
+    /** barrels [in x, y, rotation] format. */
+    public float[] barrels = {0f, 0f, 0f};
+    /** offset of barrel to start on */
+    public int barrelOffset = 0;
+
+    @Override
+    public void shoot(int totalShots, BulletHandler handler){
+        for(int i = 0; i < shots; i++){
+            int index = ((i + totalShots + barrelOffset) % (barrels.length / 3)) * 3;
+            handler.shoot(barrels[index], barrels[index + 1], barrels[index + 2], firstShotDelay + shotDelay * i);
+        }
+    }
+}