Relative fallback resolver - resolves to view templates in a sub-path of the currently set view model's template (if the current renderer has the `view_model` plugin set).
This allows for usage of partial template paths such as
some/partial, resolving to
my/module/script/path/some/partial.phtml, while rendering template
resolve(string $name, \Zend\View\Renderer\RendererInterface $renderer
$resolver : \Zend\View\Resolver\ResolverInterface
NS_SEPARATOR = '/'