Auto save current game and allow resume saved game

android/gradle.properties

assets/icons/button_delete_saved_game.png

assets/icons/button_resume_game.png

assets/icons/button_start.png

fastlane/metadata/android/en-US/changelogs/31.txt

fastlane/metadata/android/fr-FR/changelogs/31.txt

icons/build_game_icons.sh

icons/button_delete_saved_game.svg

icons/button_resume_game.svg

icons/button_start.svg

lib/layout/game.dart

lib/layout/parameters.dart

lib/provider/data.dart

lib/screens/home.dart

lib/utils/board_utils.dart

lib/utils/game_utils.dart