added return-to-top setting sanitization function
added output for hiding scroll-to-top link
added customizer setting for turning off the image zoom on hover and added output.
fixed transition styling on scroll-to-top link
changed scroll-to-top link to a button, improved styling, delayed now until 600px of scrolling
registering after-post-content widget
changed how featured image support is added
added after-post-content widget template part
added widget stylesheets and basic styling for after-post-content widget area
using hybrid for registering widgets for better HTML5 markup
styled widgets and widget area