[desktop] Add basic carousel view (#4112)

Adds a basic carousel view, or essentially a horizontal list a la Android/Qt Quick.

Lacks a lot of niceties like autoscroll, smooth shifts, etc. Will work on those later

Also fixed a bug introduced recently that capped game icon size to 8 at the low end, breaking the None option

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4112
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/qt_common/game_list/game_list_p.h

@@ -165,6 +165,7 @@ public:
                 return QStringLiteral("%1\n    %2").arg(row1, row2);
             }
             case Settings::GameListMode::GridView:
+            case Settings::GameListMode::CarouselView:
                 return row1;
             default:
                 break;