[FEATURE] Turn the page browser into an extbase plugin

Classes/Controller/ListByCategoryController.php

Classes/Controller/OverviewController.php

Classes/Controller/PageBrowserController.php

Classes/UserFunc/class.tx_pagebrowse_pi1.php

Classes/ViewHelpers/PageBrowserViewHelper.php

Configuration/TypoScript/Frontend/constants.txt

Configuration/TypoScript/Frontend/setup.txt

Resources/Private/Language/de.locallang_backend.xlf

Resources/Private/Language/locallang_backend.xlf

Resources/Private/Layouts/PageBrowser.html

Resources/Private/Partials/Pagebrowser/Pagebrowser.html

Resources/Private/Templates/PageBrowser/Index.html

Resources/Public/Scripts/ScrollBrowser.js

ext_localconf.php

ext_tables.php