Mobile/Touch devices improvements

Improvements for touch and small devices:

• handle swipe gestures and map them to horizontal scrolling,
• make all scroll event listeners passive for better performance,
• enable vertical scrolling on galleries to handle page scrolling,
• reduce margins and resize buttons for better use of mobile devices space,
• force assets enqueuing inside shortcodes for stability, remove one global content regex for performance,
• create responsive cropped square thumbnails to add responsitivity to default WP/themes square thumbs,

Bugfixes:

• fix improper scaling of square images in exhibitions.