[Map Selector] Gallery component

[Gocnak]

The map selector currently has an empty-action "view gallery" button next to the favorites button here:

This button needs to:

• Hide the rest of the selector
• Show a photo list akin to the one found in the main menu news panel, showing all the images a map has (thumbnail first, extra listed in order next to it)
• Have a "close gallery" button that brings you back to the main selector