Fancy Product Designer 6.2.1

- Tabs in Individual Product Settings not working in 4.3.4

Bugs fixed
- HTML files could not be loaded on some server, PHP fallback is used
- Replace woocommerce_duplicate_product hook with woocommerce_product_duplicate
- Product Builder: Setting height in dialog for SVG mask was not working
- Toolbar position not correct when using lightbox mode

Bugs fixed
- Semantic UI JS lib removed from backend posts to prevent conflicts with other plugins/themes
- JS error in UI composer when changing between UI layouts