[Bleeding] Add the ability for plugins to ignore cancelled events when

using the new event system.

By: md_5 <md_5@bigpond.com>

paper-api/src/main/java/org/bukkit/event/EventHandler.java

@@ -11,6 +11,7 @@ import java.lang.annotation.Target;
 @Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
 public @interface EventHandler {
-
     EventPriority priority() default EventPriority.NORMAL;
+
+    boolean ignoreCancelled() default false;
 }