Added support for recursive folder enumeration
Fix: don't filter folders by pattern

Note: don't pass an empty pattern to the recursive folder enumeration.
Added support for recursive RequireAll
New method Paladio::Load

- Paladio::Load give an unified method to load files
- Refactored Paladio::LoadPlugins to use Load
- Configuration::Load and AccessControl::Load now use Paladio::Load