Added PermissionAttachment::setPermissions()

This allows bulk permission without recalculating the new permissions until all everything is set. Permission plugins that set a big amount of nodes may want to use this method.

src/pocketmine/permission/PermissionAttachment.php

@@ -88,6 +88,17 @@ class PermissionAttachment{
 		return $this->permissions;
 	}
 
+	/**
+	 * @param bool[] $permissions
+	 */
+	public function setPermissions(array $permissions){
+		$this->permissions = [];
+		foreach($permissions as $key => $value){
+			$this->permissions[$key] = (bool) $value;
+		}
+		$this->permissible->recalculatePermissions();
+	}
+
 	/**
 	 * @param string|Permission $name
 	 * @param bool              $value