Drop a bunch of invalid null defaults

phpstan doesn't report these out of the box, for reasons I'm not clear on. It's also not clear if having null defaults has any effect on nullability behaviour, so they are best removed. In addition, these would be problematic on 7.4.

src/pocketmine/Player.php

@@ -286,7 +286,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	/** @var PlayerCursorInventory */
 	protected $cursorInventory;
 	/** @var CraftingGrid */
-	protected $craftingGrid = null;
+	protected $craftingGrid;
 	/** @var CraftingTransaction|null */
 	protected $craftingTransaction = null;
 
@@ -348,7 +348,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	protected $flying = false;
 
 	/** @var PermissibleBase */
-	private $perm = null;
+	private $perm;
 
 	/** @var int|null */
 	protected $lineHeight = null;

src/pocketmine/Server.php

@@ -193,16 +193,16 @@ class Server{
 	private $tickSleeper;
 
 	/** @var BanList */
-	private $banByName = null;
+	private $banByName;
 
 	/** @var BanList */
-	private $banByIP = null;
+	private $banByIP;
 
 	/** @var Config */
-	private $operators = null;
+	private $operators;
 
 	/** @var Config */
-	private $whitelist = null;
+	private $whitelist;
 
 	/** @var bool */
 	private $isRunning = true;
@@ -211,13 +211,13 @@ class Server{
 	private $hasStopped = false;
 
 	/** @var PluginManager */
-	private $pluginManager = null;
+	private $pluginManager;
 
 	/** @var float */
 	private $profilingTickRate = 20;
 
 	/** @var AutoUpdater */
-	private $updater = null;
+	private $updater;
 
 	/** @var AsyncPool */
 	private $asyncPool;
@@ -255,10 +255,10 @@ class Server{
 	private $memoryManager;
 
 	/** @var CommandReader */
-	private $console = null;
+	private $console;
 
 	/** @var SimpleCommandMap */
-	private $commandMap = null;
+	private $commandMap;
 
 	/** @var CraftingManager */
 	private $craftingManager;
@@ -324,7 +324,7 @@ class Server{
 	private $queryHandler = null;
 
 	/** @var QueryRegenerateEvent */
-	private $queryRegenerateTask = null;
+	private $queryRegenerateTask;
 
 	/** @var Config */
 	private $properties;

src/pocketmine/block/BlockFactory.php

@@ -33,22 +33,22 @@ use function min;
  */
 class BlockFactory{
 	/** @var \SplFixedArray<Block> */
-	private static $fullList = null;
+	private static $fullList;
 
 	/** @var \SplFixedArray<bool> */
-	public static $solid = null;
+	public static $solid;
 	/** @var \SplFixedArray<bool> */
-	public static $transparent = null;
+	public static $transparent;
 	/** @var \SplFixedArray<float> */
-	public static $hardness = null;
+	public static $hardness;
 	/** @var \SplFixedArray<int> */
-	public static $light = null;
+	public static $light;
 	/** @var \SplFixedArray<int> */
-	public static $lightFilter = null;
+	public static $lightFilter;
 	/** @var \SplFixedArray<bool> */
-	public static $diffusesSkyLight = null;
+	public static $diffusesSkyLight;
 	/** @var \SplFixedArray<float> */
-	public static $blastResistance = null;
+	public static $blastResistance;
 
 	/**
 	 * Initializes the block factory. By default this is called only once on server start, however you may wish to use

src/pocketmine/item/ItemFactory.php

@@ -47,7 +47,7 @@ class ItemFactory{
 	 * @var \SplFixedArray
 	 * @phpstan-var \SplFixedArray<Item>
 	 */
-	private static $list = null;
+	private static $list;
 
 	/**
 	 * @return void

src/pocketmine/level/Level.php

@@ -265,7 +265,7 @@ class Level implements ChunkManager, Metadatable{
 	/** @var bool */
 	private $clearChunksOnTick;
 	/** @var \SplFixedArray<Block> */
-	private $randomTickBlocks = null;
+	private $randomTickBlocks;
 
 	/** @var LevelTimings */
 	public $timings;

src/pocketmine/network/mcpe/protocol/PacketPool.php

@@ -28,7 +28,7 @@ use pocketmine\utils\BinaryDataException;
 
 class PacketPool{
 	/** @var \SplFixedArray<DataPacket> */
-	protected static $pool = null;
+	protected static $pool;
 
 	/**
 	 * @return void

src/pocketmine/permission/BanEntry.php

@@ -38,7 +38,7 @@ class BanEntry{
 	/** @var string */
 	private $name;
 	/** @var \DateTime */
-	private $creationDate = null;
+	private $creationDate;
 	/** @var string */
 	private $source = "(Unknown)";
 	/** @var \DateTime|null */