#973: Improve spawner API and add API for Trial Spawners

By: coll1234567 <joshl5324@gmail.com>

paper-api/src/main/java/org/bukkit/entity/minecart/SpawnerMinecart.java

@@ -1,10 +1,11 @@
 package org.bukkit.entity.minecart;
 
 import org.bukkit.entity.Minecart;
+import org.bukkit.spawner.Spawner;
 
 /**
  * Represents a Minecart with an {@link org.bukkit.block.CreatureSpawner
  * entity spawner} inside it.
  */
-public interface SpawnerMinecart extends Minecart {
+public interface SpawnerMinecart extends Minecart, Spawner {
 }