Settings in YAML format

Using Symfony's YAML parser (Composer: symfony/yaml)
Renamed classes Database_..._Driver -> Database_..._Connection
Added class Database_Connection replacing ww_open_db() function
Added Util::matchesPatternList() replacing function is_current_path()
Added Util::makePageURL() replacing function page()
Added Util::makeURL() replacing function u()
Fixed indentation and coding style