Option to hide nav_entries (#1764)

* put nav_entries in a div so they can be hidden, add config option, no labels yet

* add English text for hide_nav_entries, choose better name

* Update conf.php

add comma to last item

* hide nav_entries by optionally not rendering in normal.phtml

* fix logic, remove containing div

* apply phpcbf to ConfigurationSetter.php

* Make navigation buttons options positive

And add TODOs for i18n, and add default config.
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