GeneratePress Premium 2.5.0

Sites: Prevent PHP notice when Sites can't be reached

Blog: Fix infinite scroll masonry issues in Firefox
General: Improve smooth scroll script
Import/Export: Show modules to export if defined in wp-config.php
Sites: Prevent PHP warnings if no Sites are found
Sites: Add generate_disable_site_library filter to disable Site Library
Sites: Improve page builder filter display
Sites: Prevent duplicate site display after details button in preview clicked
WooCommerce: Add missing icons if Font Awesome is turned off

* New: Sites module
* Translations: Merge all translations into gp-premium text domain
* General: Add smooth scroll option
* General: Move batch processing files into library
* General: Add GPP icon set
* General: WPCS and PHPCS improvements
* Blog: Fix PHP 7.2 warning
* Blog: Fix Safari infinite scroll issues with srcset
* Blog: Refresh masonry on infinite scroll append
* Blog: Remove infinite scroll on 404 and no results pages
* Blog: Fix Yoast SEO breaking columns with certain settings
* Blog: Re-layout masonry on load
* Colors: Add slideout navigation color options
* Colors: Merge navigation + sub-navigation options into one section
* Import/Export: One click export and import
* Menu Plus: Re-build slideout navigation to use vanilla JS
* Menu Plus: Add slideout navigation widget area
* Menu Plus: Add close icon to slideout navigation
* Menu Plus: Set sticky nav ID on refresh if stuck
* Menu Plus: Allow WPML to modify Page Header select metabox
* Menu Plus: Re-build mobile header using flexbox
* Menu Plus: Use CSS for slideout navigation icon
* Menu Plus: Fix sticky navigation slide down in Safari
* Menu Plus: Add workaround for iOS sticky nav search issue
* Page Header: Improve Page Header metabox UI on smaller screens
* Page Header: Use author display name in template tag
* Page Header: Add generate_page_header_id filter
* Page Header: Fix vertical center issues in IE11
* Page Header: Remove flexibility.js for IE8 support
* Page Header: Fix GiveWP compatibility
* Secondary Navigation: Re-build CSS
* Sections: Disable Gutenberg if Sections are activated
* Sections: Add generate_sections_gutenberg_compatible filter
* Spacing: Fix one container widget padding preview in Customizer
* Typography: Add Slideout Navigation typography options
* WooCommerce: Clear up-sells when directly after entry content
* WooCommerce: Fix placeholder text cut off in Firefox
* WooCommerce: Use GPP icon set for cart menu item
* WooCommerce: Load .js in the footer
* Update Background Process library
* Clean up code license key activation code
* Remove verify.php
* Prevent PHP notice when saving empty license
* Add beta testing checkbox to license key area