Add 2 parameters to [user_favorites] shortcode to filter by taxonomy terms also

[w3b-beweb]

Added 2 arguments to the shortcode:

• taxonomy
• terms

Simply uses already coded Favorites filters, to filter user favorites by taxonomy terms, as well as by post type

[w3b-beweb]

Unfortunately, the [favorites_button] is not aware of the taxonomy filter, so when you click the button to add or remove a favorite, it updates the list showing all favourite posts, regardless the filters defines in [user_favorites] shortcode used to generate the list at load page time.