Merge remote-tracking branch 'origin/stable'

# Conflicts:
#	composer.json
#	composer.lock
#	resources/vanilla
#	src/CrashDump.php
#	src/PocketMine.php
#	src/pocketmine/Server.php
#	src/pocketmine/item/Bucket.php
#	src/pocketmine/item/Item.php
#	src/pocketmine/level/format/Chunk.php
#	src/pocketmine/level/format/io/leveldb/LevelDB.php
#	src/pocketmine/level/format/io/region/McRegion.php
#	src/pocketmine/network/mcpe/protocol/BatchPacket.php
#	src/pocketmine/tile/Furnace.php
#	src/pocketmine/utils/UUID.php
#	src/utils/ServerKiller.php

src/utils/EnumTrait.php

@@ -87,7 +87,7 @@ trait EnumTrait{
 		}
 		$this->enumName = $enumName;
 		if(self::$nextId === null){
-			self::$nextId = getmypid(); //this provides enough base entropy to prevent hardcoding
+			self::$nextId = Process::pid(); //this provides enough base entropy to prevent hardcoding
 		}
 		$this->runtimeId = self::$nextId++;
 	}