Added Rule lightningKillsDrops

Which fixes [MC-206922](https://bugs.mojang.com/browse/MC-206922)

src/main/java/carpet/mixins/ItemEntityMixin.java

@@ -7,8 +7,10 @@ import net.minecraft.block.ShulkerBoxBlock;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.ItemEntity;
+import net.minecraft.entity.LightningEntity;
 import net.minecraft.item.BlockItem;
 import net.minecraft.item.ItemStack;
+import net.minecraft.server.world.ServerWorld;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
@@ -29,6 +31,17 @@ public abstract class ItemEntityMixin extends Entity implements ItemEntityInterf
         super(entityType_1, world_1);
     }
 
+    @Override
+    public void onStruckByLightning(ServerWorld world, LightningEntity lightning) {
+        if (CarpetSettings.lightningKillsDropsFix) {
+            if (this.age > 8) { //Only kill item if its older then 8 ticks
+                super.onStruckByLightning(world, lightning);
+            }
+        } else {
+            super.onStruckByLightning(world, lightning);
+        }
+    }
+
     @Override
     public int getAgeCM() {
         return this.age;