Combine Post Lists in Filter Settings w/ matched filter

[EkoJR]

When selecting which post list to select, multiple filter boxes appear. This forces the user to use multiple filters even if the filters (taxonomy & terms) match. Also, having filters slightly differ could cause an extra query_args, and allowing better merge control on the admin ui may improve optimization.

Allow the ability to combine post types into one filter box.

• Check taxonomies, and disable (grey-out) taxonomies that don't match.