PhpStorm inspections

Fixed some minor bugs and dropped some obsolete code

pocketmine\level\generator namespace is ignored in this commit

src/pocketmine/permission/Permission.php

@@ -173,13 +173,13 @@ class Permission{
 	 * @param string|Permission $name
 	 * @param                   $value
 	 *
-	 * @return Permission|void Permission if $name is a string, void if it's a Permission
+	 * @return Permission|null Permission if $name is a string, null if it's a Permission
 	 */
 	public function addParent($name, $value){
 		if($name instanceof Permission){
 			$name->getChildren()[$this->getName()] = $value;
 			$name->recalculatePermissibles();
-			return;
+			return null;
 		}else{
 			$perm = Server::getInstance()->getPluginManager()->getPermission($name);
 			if($perm === null){

src/pocketmine/permission/PermissionAttachment.php

@@ -89,9 +89,6 @@ class PermissionAttachment{
 		return $this->permissions;
 	}
 
-	/**
-	 * @return bool[]
-	 */
 	public function clearPermissions(){
 		$this->permissions = [];
 		$this->permissible->recalculatePermissions();