First version of NewUI main menu
Merge remote-tracking branch 'upstream/master' into new-ui-main-menu

Conflicts:
	widgets/lib/spark_menu/spark_menu.css
	widgets/lib/spark_menu_button/spark_menu_button.css
	widgets/lib/spark_menu_item/spark_menu_item.css
Minor adjustments
Changed menu color
Merge pull request #2087 from ussuri/new-ui-main-menu

[New UI] Main menu