Change API

[janpecha]

$phpdepend->getDefinedClasses();
$phpdepend->getRequiredClasses();

$phpdepend->getDefinedClasses($phpdepend::CLASSES);
$phpdepend->getDefinedClasses($phpdepend::INTERFACES);
$phpdepend->getDefinedClasses($phpdepend::TRAITS);

$phpdepend->getDefinedClasses($phpdepend::CLASSES | $phpdepend::TRAITS);

// maybe
$phpdepend->getDefinedNamespaces();
$phpdepend->getDefinedUses(); // ??? [namespace => string[]]

See #4

$phpdepend->getRequiredClasses(); // soft + hard
$phpdepend->getRequiredClasses($phpdepend::SOFT);
$phpdepend->getRequiredClasses($phpdepend::HARD);