message: More color utility classes
diff: .Color
  - &--public
  - color colors-channel-public
  - &--closed
  - color colors-channel-closed
  - &--private
  - color colors-channel-private
  + color-states = channel-public channel-closed channel-private state-premium
  +
  + for state in color-states
  + &--{state}
  + &, input
  + color lookup('colors-' + state)
  