Update/improve application architecture

android/app/build.gradle

android/gradle.properties

assets/fonts/Nunito-Bold.ttf

assets/fonts/Nunito-Light.ttf

assets/fonts/Nunito-Medium.ttf

assets/fonts/Nunito-Regular.ttf

assets/icons/button_back.png

assets/icons/button_start.png

assets/icons/game_fail.png

assets/icons/game_win.png

assets/icons/level_easy.png

assets/icons/level_normal.png

assets/icons/skin_default.png

assets/skins/default_empty.png

assets/translations/en.json

assets/translations/fr.json

fastlane/metadata/android/en-US/changelogs/10.txt

fastlane/metadata/android/fr-FR/changelogs/10.txt

icons/build_game_icons.sh

icons/build_repository_icons.sh