Normalize game architecture

resources/data/words/words-7-fr-dictionary.txt

resources/data/words/words-7-fr-easy.txt

resources/data/words/words-7-fr-normal.txt

resources/data/words/words-8-fr-dictionary.txt

resources/data/words/words-8-fr-easy.txt

resources/data/words/words-8-fr-normal.txt

resources/data/words_lists_stats.sh

resources/ui/build_ui_resources.sh

resources/ui/images/button_back.svg

resources/ui/images/button_delete_saved_game.svg

resources/ui/images/button_resume_game.svg

resources/ui/images/button_start.svg

resources/ui/images/game_fail.svg

resources/ui/images/game_win.svg

resources/ui/images/key.svg

resources/ui/images/placeholder.svg

resources/ui/skins/default/empty.svg

resources/ui/skins/default/good.svg

resources/ui/skins/default/misplaced.svg

resources/ui/skins/default/wrong.svg