Generic cleanup of warnings, whitespace and style.

src/main/java/org/bukkit/event/player/PlayerCommandPreprocessEvent.java

@@ -6,6 +6,7 @@ import org.bukkit.entity.Player;
  * Called early in the command handling process. This event is only
  * for very exceptional cases and you should not normally use it.
  */
+@SuppressWarnings("serial")
 public class PlayerCommandPreprocessEvent extends PlayerChatEvent {
     public PlayerCommandPreprocessEvent(final Player player, final String message) {
         super(Type.PLAYER_COMMAND_PREPROCESS, player, message);