Added Event allocation pool, updated SPL with Class::onClassLoaded()

src/pocketmine/event/level/ChunkLoadEvent.php

@@ -28,6 +28,8 @@ use pocketmine\level\format\FullChunk;
  */
 class ChunkLoadEvent extends ChunkEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 
 	private $newChunk;
 

src/pocketmine/event/level/ChunkPopulateEvent.php

@@ -26,4 +26,6 @@ namespace pocketmine\event\level;
  */
 class ChunkPopulateEvent extends ChunkEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/ChunkUnloadEvent.php

@@ -28,4 +28,6 @@ use pocketmine\event\Cancellable;
  */
 class ChunkUnloadEvent extends ChunkEvent implements Cancellable{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/LevelInitEvent.php

@@ -26,4 +26,6 @@ namespace pocketmine\event\level;
  */
 class LevelInitEvent extends LevelEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/LevelLoadEvent.php

@@ -26,4 +26,6 @@ namespace pocketmine\event\level;
  */
 class LevelLoadEvent extends LevelEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/LevelSaveEvent.php

@@ -26,4 +26,6 @@ namespace pocketmine\event\level;
  */
 class LevelSaveEvent extends LevelEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/LevelUnloadEvent.php

@@ -28,4 +28,6 @@ use pocketmine\event\Cancellable;
  */
 class LevelUnloadEvent extends LevelEvent implements Cancellable{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 }

src/pocketmine/event/level/SpawnChangeEvent.php

@@ -30,6 +30,8 @@ use pocketmine\level\Position;
  */
 class SpawnChangeEvent extends LevelEvent{
 	public static $handlerList = null;
+	public static $eventPool = [];
+	public static $nextEvent = 0;
 
 	/** @var Position */
 	private $previousSpawn;