#898: Use Java Consumer instead of Bukkit Consumer

By: DerFrZocker <derrieple@gmail.com>

paper-api/src/main/java/org/bukkit/util/Consumer.java

@@ -5,13 +5,19 @@ package org.bukkit.util;
  * result.
  *
  * @param <T> the type of the input to the operation
+ * @deprecated Use {@link java.util.function.Consumer} instead
  */
-public interface Consumer<T> {
+// Bukkit developer note (NOT plugin developers):
+// NEVER use this consumer in the API.
+// API methods which use this consumer will be remapped to Java's consumer at runtime, resulting in an error.
+@Deprecated
+public interface Consumer<T> extends java.util.function.Consumer<T> {
 
     /**
      * Performs this operation on the given argument.
      *
      * @param t the input argument
      */
+    @Override
     void accept(T t);
 }