Multi shotgun fix (#8460)

* Multi-barrel shotgun fix

* multi-recoil support

* @Nullable for everything

core/src/mindustry/world/draw/DrawTurret.java

@@ -75,6 +75,7 @@ public class DrawTurret extends DrawBlock{
             var params = DrawPart.params.set(build.warmup(), 1f - progress, 1f - progress, tb.heat, tb.curRecoil, tb.charge, tb.x + tb.recoilOffset.x, tb.y + tb.recoilOffset.y, tb.rotation);
 
             for(var part : parts){
+                params.setRecoil(part.recoilIndex >= 0 ? tb.curRecoils[part.recoilIndex] : tb.curRecoil);
                 part.draw(params);
             }
         }