[TASK] NL-3241 Menu builder v0.1 finished

Classes/Domain/Model/MenuGroup.php

Classes/Domain/Model/MenuItem.php

Classes/Hooks/ItemsProcFunc.php

Classes/ViewHelpers/Widget/Controller/ShowController.php

Classes/ViewHelpers/Widget/ShowViewHelper.php

...iguration/TCA/tx_nlmenubuilder_domain_model_menugroup.php

Configuration/TypoScript/setup.txt

Resources/Private/Language/locallang.xlf

Resources/Private/Language/locallang_db.xlf

Resources/Private/Partials/Menu.html

Resources/Private/Partials/MenuItem/Content.html

Resources/Private/Partials/MenuItem/Link.html

Resources/Private/Partials/MenuItem/Page.html

Resources/Private/Partials/MenuItem/Submenu.html

...rces/Private/Templates/ViewHelpers/Widget/Show/Index.html

...urces/Private/Templates/ViewHelpers/Widget/Show/Show.html

ext_tables.sql