[REF] point_of_sale: migration to OWL framework

addons/point_of_sale/__manifest__.py

addons/point_of_sale/controllers/main.py

addons/point_of_sale/static/src/css/pos.css

addons/point_of_sale/static/src/js/Chrome.js

.../point_of_sale/static/src/js/ChromeWidgets/CashierName.js

...of_sale/static/src/js/ChromeWidgets/ClientScreenButton.js

.../point_of_sale/static/src/js/ChromeWidgets/DebugWidget.js

...point_of_sale/static/src/js/ChromeWidgets/HeaderButton.js

...oint_of_sale/static/src/js/ChromeWidgets/OrderSelector.js

.../point_of_sale/static/src/js/ChromeWidgets/ProxyStatus.js

..._of_sale/static/src/js/ChromeWidgets/SaleDetailsButton.js

...t_of_sale/static/src/js/ChromeWidgets/SyncNotification.js

addons/point_of_sale/static/src/js/ClassRegistry.js

addons/point_of_sale/static/src/js/ComponentRegistry.js

addons/point_of_sale/static/src/js/Gui.js

addons/point_of_sale/static/src/js/Misc/Draggable.js

addons/point_of_sale/static/src/js/Misc/NotificationSound.js

addons/point_of_sale/static/src/js/Misc/NumberBuffer.js

addons/point_of_sale/static/src/js/PopupControllerMixin.js

...nt_of_sale/static/src/js/Popups/AbstractAwaitablePopup.js