Add class for loading functions

[glady]

Currently no function autoloading is available, but sometimes it is nescessary to load functions for a specific namespace.

Add a prototype for load functions by include of a specific file and with possibility to call an own implemented "\glady\Behind\function_exists" that triggers autoloading when function not defined (Should be replaced later by: https://wiki.php.net/rfc/function_autoloading).