Novashare 1.5.6

Added new Highlight feature which allows for sharing of highlighted text in page and post content to supported networks.
Adjusted aria-label attributes throughout the plugin to be more specific to element actions.
Fixed an issue where the inline JavaScript wasn’t printing correctly if only the floating bar was being used on the page.
Fixed the missing plugin UI color for the Hacker News network.
Fixed an issue where Pinterest image buttons were displaying incorrectly if there was another pinit.js script loading on the site.
Fixed an issue with the logo scaling in the plugin UI on smaller devices.
Translation updates.

* Fixed an issue where image pin links were not opening correctly when sharing a single image.
* Fixed multiple minor image pin styling issues.

* Fixed an issue where the old twitter domain link was redirecting and duplicating the query string parameters passed through.
* Added an additional post object check to prevent a PHP warning in certain cases.
* Updated our staging site license key exception list with additional formats.
* Minor style adjustments to the plugin UI.