For the iPad design, the explore view will be modified to support multiple columns of cards.

• Replace the explore VC table with a collection view
• Update all cell subclasses to be collection view cells
• Create a collection view layout that supports a single column at a specified width
• Create a collection view layout that supports specified number of multiple columns (this can be the same as the first, but not required)
• Create a tweak to toggle between 1, 2, and 3 columns in portrait on iPad
• Create a tweak to toggle between 1, 2, and 3, and 4 columns in landscape on iPad
• Update "more" tables to be collection views