new behaviour: detects and ignore pre-defined classes, class constants, properties, methods

New config file $conf->t_ignore_pre_defined_classes element, replacing the old $conf->t_ignore_module_methods.
see config.cnf for more details

Ignore pre-defined classes, class constants, properties, methods.
if a use statement is present, do not shuffle statements that are located before the last use statement.
namespaces and classes are now sharing the same obfuscation context in order to be alias compliant.