Add Lighting system

List of features and changes:

• introduce a new lighting system that replaces the old one
• all old API calls are mapped so that it will use the new lighting system internally
• the new lighting system use for its colors a vector representation with values between 0 and 1. This allows to manipulate colors more easily. It is possible to mix the old and new representation in the configuration as they are converted automatically.
• the lighting system provides for each led its own configuration
• each configuration can have multiple effect channels that are blended together to get the resulting color
• 14 blend methods added
  • bottom
  • top
  • add
  • subtract
  • subtract_b
  • difference
  • average
  • multiply
  • divide
  • divide_inv
  • screen
  • lighten
  • darken
  • overlay
• each effect determine how to compute its color. All of them has their own configuration. It is possible to combine effects together.
• 8 effects added
  • static: provides a static color
  • blink: will turn the color on and off. If multiple colors are specified it will cycle through them.
  • linear-fade: Will fade between the colors in the list.
  • breath: will show breathing animation (inhale - exhale)
  • strobe: shows a stroboscopic effect. Warning: Fast flashing lights!
  • twinkle: The LED will twinkle randomly like falling stars. If colors are provided it will randomly use one.
  • queue: queue effects together to play one after another
  • channel: combines and blend multiple effects to get a more complex result
• add 7 API methods to get and set the new lighting system. Documentation is in the extended API spec.
• add possibility to temporary override the current lighting config. This will play the specified animation for a short time and resume the normal animation after that.
• Add /api/v1/hello that will make use of the temporary override.