Generic cleanup of warnings, whitespace and style.

By: Erik Broes <erikbroes@grum.nl>

paper-api/src/main/java/org/bukkit/plugin/IllegalPluginAccessException.java

@@ -3,6 +3,7 @@ package org.bukkit.plugin;
 /**
  * Thrown when a plugin attempts to interact with the server when it is not enabled
  */
+@SuppressWarnings("serial")
 public class IllegalPluginAccessException extends RuntimeException {
 
     /**
@@ -12,6 +13,7 @@ public class IllegalPluginAccessException extends RuntimeException {
 
     /**
      * Constructs an instance of <code>IllegalPluginAccessException</code> with the specified detail message.
+     *
      * @param msg the detail message.
      */
     public IllegalPluginAccessException(String msg) {