Merge branch '25-clean-improve-update-code' into 'master'

resources/ui/images/button_resume_game.svg

resources/ui/images/button_start.svg

resources/ui/images/game_win.svg

resources/ui/images/placeholder.svg

resources/ui/skins/default/1.png

resources/ui/skins/default/2.png

resources/ui/skins/default/3.png

resources/ui/skins/default/4.png

resources/ui/skins/default/5.png

resources/ui/skins/default/6.png

resources/ui/skins/default/7.png

resources/ui/skins/default/8.png

resources/ui/skins/default/found.png

resources/ui/skins/default/unknown.png