Total Theme helper classes for responsibility

Just for my own references. These are the helper classes which I always search for.

• hidden – Always Hidden
• show-at-mm-breakpoint – Visible At Mobile Menu Breakpoint
• hide-at-mm-breakpoint – Hidden At Mobile Menu Breakpoint
• hidden-desktop-large – Hidden on Large Desktops (1280px or greater)
• hidden-desktop – Hidden on Desktop (1024px or greater)
• hidden-tablet – Hidden on Tablets (768px to 1023px)
• hidden-phone – Hidden on Phones (767px or smaller)
• visible-desktop-large – Visible on Large Desktops (1280px or greater)
• visible-desktop – Visible on Desktop (1024px or greater)
• visible-phone – Visible on Phones (767px or smaller)
• visible-tablet – Visible on Tablets (768px to 1023px)