Add utility method to check if entity is holding a wrench.

src/main/java/li/cil/oc2/common/integration/Wrenches.java

@@ -1,6 +1,7 @@
 package li.cil.oc2.common.integration;
 
 import li.cil.oc2.common.tags.ItemTags;
+import net.minecraft.entity.Entity;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 
@@ -14,4 +15,14 @@ public final class Wrenches {
     public static boolean isWrench(final Item item) {
         return item.isIn(ItemTags.WRENCHES);
     }
+
+    public static boolean isHoldingWrench(final Entity entity) {
+        for (final ItemStack stack : entity.getHeldEquipment()) {
+            if (isWrench(stack.getItem())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }