GUI: Add an icon grid to the launcher display #3135
This is part of the GSoC '21 project : "GUI for Game Library Management"
Add a grid of game icons to the launcher as an alternative display to the existing list display of games. A toggle-able grid view, using game icons from the https://github.com/scummvm/scummvm-icons repo and flag icons from https://flagpedia.net. Clicking on a game brings up a tray of the common game-related tasks.