More minigames

Math Merge minigame: apply math operators to get 3 or more similar numbers nearby

Match X minigame: move number to match 2 of twos, 3 of threes, 4 of fours etc

Artist minigame: pick brush opacity to mix colors and get the required color for each tile

faster loading of icons (relevant if you have many DLCs installed and possibly thousands of images)

minor fixes