Improve game architecture, massive code rewrite

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/boardSize_10.png

assets/icons/boardSize_14.png

assets/icons/boardSize_20.png

assets/icons/boardSize_6.png

assets/icons/colorsCount_5.png

assets/icons/colorsCount_6.png

assets/icons/colorsCount_7.png

assets/icons/colorsCount_8.png

assets/icons/level_easy.png

assets/icons/level_hard.png

assets/icons/level_medium.png

assets/icons/level_nightmare.png

assets/translations/en.json

assets/translations/fr.json