Merge branch '75-use-flutter-linter-and-apply-lints' into 'master'

analysis_options.yaml

android/app/build.gradle

android/gradle.properties

fastlane/metadata/android/en-US/changelogs/62.txt

fastlane/metadata/android/fr-FR/changelogs/62.txt

lib/entities/cell.dart

lib/layout/board.dart

lib/layout/game.dart

lib/layout/parameters.dart

lib/main.dart

lib/provider/data.dart

lib/screens/home.dart

lib/utils/board_animate.dart

lib/utils/board_utils.dart

lib/utils/game_utils.dart

lib/utils/random_pick_grid.dart

pubspec.lock

pubspec.yaml