New weapon pattern system

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

@@ -0,0 +1,14 @@
+package mindustry.entities.pattern;
+
+public class SpreadPattern extends ShotPattern{
+    /** spread between bullets, in degrees. */
+    public float spread = 5f;
+
+    @Override
+    public void shoot(int totalShots, BulletHandler handler){
+        for(int i = 0; i < shots; i++){
+            float angleOffset = i * spread - (shots - 1) * spread / 2f;
+            handler.shoot(0, 0, angleOffset, firstShotDelay + shotDelay * i);
+        }
+    }
+}