Wrap PocketMine.php body inside a function

this isolates variables from the global scope and also prevents doxygen documenting these variables.

src/pocketmine/PocketMine.php

@@ -121,6 +121,7 @@ namespace pocketmine {
 		return $messages;
 	}
 
+	function server(){
 		if(!empty($messages = check_platform_dependencies())){
 			echo PHP_EOL;
 			$binary = version_compare(PHP_VERSION, "5.4") >= 0 ? PHP_BINARY : "unknown";
@@ -293,4 +294,7 @@ namespace pocketmine {
 		echo Terminal::$FORMAT_RESET . PHP_EOL;
 
 		exit($exitCode);
+	}
+
+	\pocketmine\server();
 }