Register all user defined functions

[elrafael]

A fancy way to do that.

Still needs to test. And maybe remove twig_ and _twig functions once these are inside get_defined_functions array (the user array).

[waptik]

Thanks for the tip but it seems not to work. Here's the error message I get:

A PHP Error was encountered

Severity: 4096

Message: Object of class Twiggy could not be converted to string