Added IPNIgnore for compat with *Inventory Profiles Next*

src/main/java/org/anti_ad/mc/ipn/api/IPNIgnore.java

@@ -0,0 +1,8 @@
+package org.anti_ad.mc.ipn.api;
+
+import java.lang.annotation.*;
+
+// Included from "Inventory Profiles Next" (https://github.com/blackd/Inventory-Profiles)
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface IPNIgnore {}