Add smart light bulbs support

[guyluz11]

Let's add support for the app to set the smart light bulb brightness based on the time of day, and color based on the type of activity the user is doing.

[guyluz11]

Some packages for controlling smart light bulbs from different companies

  dart_ewelink_api:
    git:
      url: "https://github.com/guyluz11/dart_ewelink_api.git"
      ref: "develop"

  hue_dart:
    git:
      url: "https://github.com/guyluz11/hue_dart.git"

  # Implementation of the LIFX HTTP API
  lifx_http_api: ^0.0.17

  mi_iot_token: ^1.1.0

  # Communicate with Shelly smart devices
  shelly:
    git: "https://github.com/CyBear-Jinni/shelly.git"

  # Controlling Yeelight products over LAN.
  yeedart: ^0.3.2

[guyluz11]

Let's first add tips for changing the light color based on the time of day and the type of activity.

#202