Improve game architecture

android/app/build.gradle

android/gradle.properties

assets/icons/button_delete_saved_game.png

assets/icons/button_resume_game.png

assets/icons/game_fail.png

assets/icons/layout_diamond.png

assets/icons/layout_english.png

assets/icons/layout_french.png

assets/icons/layout_german.png

assets/icons/skin_default.png

assets/translations/en.json

assets/translations/fr.json

fastlane/metadata/android/en-US/changelogs/18.txt

fastlane/metadata/android/fr-FR/changelogs/18.txt

icons/build_game_icons.sh

icons/button_delete_saved_game.svg

icons/button_resume_game.svg

icons/game_fail.svg

icons/layout_diamond.svg

icons/layout_english.svg