#757: PoweredMinecart - add getter/setter for fuel

By: Shane Bee <shanebolenback@me.com>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartFurnace.java

@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.google.common.base.Preconditions;
 import net.minecraft.server.EntityMinecartFurnace;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EntityType;
@@ -11,6 +12,22 @@ public class CraftMinecartFurnace extends CraftMinecart implements PoweredMineca
         super(server, entity);
     }
 
+    @Override
+    public EntityMinecartFurnace getHandle() {
+        return (EntityMinecartFurnace) entity;
+    }
+
+    @Override
+    public int getFuel() {
+        return getHandle().e;
+    }
+
+    @Override
+    public void setFuel(int fuel) {
+        Preconditions.checkArgument(fuel >= 0, "ticks cannot be negative");
+        getHandle().e = fuel;
+    }
+
     @Override
     public String toString() {
         return "CraftMinecartFurnace";