browser side: menus refactorisation: - use of the new quick_frontends.quick_menus module, resulting in a big code simplification in Libervia - menu are added in there respective modules: main menus are done directely in libervia_main, while tarot and radiocol menus are done in game_tarot and game_radiocol - launchAction has the same signature as in QuickApp - base_menu: there are now 2 classes to launch an action: MenuCmd which manage quick_menus classes, and SimpleCmd to launch a generic callback - base_menu: MenuNode has been removed as logic is now in quick_menus - base_menu: GenericMenuBar.update method can be called to fully (re)build the menus - base_widget: removed WidgetSubMenuBar which is no more useful (GenericMenuBar do the same thing) - plugin_menu_context is used in LiberviaWidget and other classes with menus to indicate which menu types must be used - otr menus hooks are temporarily removed, will be fixed soon