Merge branch '44-clean-improve-update-code' into 'master'

android/gradle.properties

assets/skins/default_img1.png

assets/skins/default_img2.png

assets/skins/default_img3.png

assets/skins/default_img4.png

assets/skins/default_img5.png

assets/skins/default_img6.png

assets/skins/default_img7.png

assets/skins/default_img8.png

assets/skins/default_img9.png

assets/ui/button_back.png

assets/ui/button_delete_saved_game.png

assets/ui/button_resume_game.png

assets/ui/button_start.png

lib/config/default_game_settings.dart

lib/config/default_global_settings.dart

lib/ui/helpers/styled_button.dart

lib/ui/layouts/parameters_layout.dart

lib/ui/parameters/parameter_image.dart

lib/ui/parameters/parameter_painter.dart