shadow slots work + minor fixes

src/boot/after_store.js

src/components/button.style.js

src/components/input.style.js

src/components/settings_modal/tabs/theme_tab/theme_tab.js

src/components/shadow_control/shadow_control.js

src/services/style_setter/style_setter.js

src/services/theme_data/css_utils.js

src/services/theme_data/theme2_to_theme3.js

src/services/theme_data/theme3_slot_functions.js

src/services/theme_data/theme_data_3.service.js