Missing v2 cannonical FQSNs in Zend\View\Helper\Navigation\PluginManager.php (2.6.0 release)

[michalbundyra]

For backward compatibility we are missing in https://github.com/zendframework/zend-view/blob/master/src/Helper/Navigation/PluginManager.php#L47-L52 v2 canonical FQCNs:

    'zendviewhelpernavigationcreadcrumbs' => InvokableFactory::class,
    'zendviewhelpernavigationlinks' => InvokableFactory::class,
    'zendviewhelpernavigationmenu' => InvokableFactory::class,
    'zendviewhelpernavigationsitemap' => InvokableFactory::class,

as we have in: https://github.com/zendframework/zend-view/blob/master/src/HelperPluginManager.php#L186

(It was noticed by @tmcnicholls in #45 (comment))

[weierophinney]

I'll address this in #47; adding some code for this now.