Begin implementation of CheckStyle style checking

By: md_5 <git@md-5.net>

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

@@ -24,7 +24,7 @@ public @interface EventHandler {
      * <li>HIGHEST
      * <li>MONITOR
      * </ol>
-     * 
+     *
      * @return the priority
      */
     EventPriority priority() default EventPriority.NORMAL;
@@ -34,7 +34,7 @@ public @interface EventHandler {
      * <p>
      * If ignoreCancelled is true and the event is cancelled, the method is
      * not called. Otherwise, the method is always called.
-     * 
+     *
      * @return whether cancelled events should be ignored
      */
     boolean ignoreCancelled() default false;