Add dimmer

[JELoohuis]

• Added support for the dimmer category of devices.
  The following capabilities were implemented and tested:

  • onoff (switch_led_1, switch_led_2)
  • dim (bright_value_1, bright_value_2)

  The onoff is handled the same as in sockets, with 1 channel devices using the default capability,
  and 2 channel devices using it to turn both channels on/off, with sub-capabilities for the separate channels.

  In 2 channel devices the default dim capability is removed in favor of just sub-capabilities.

  The following settings were implemented and tested:

  • Minimum brightness (brightness_min_1, brightness_min_2)
  • Maximum brightness (brightness_max_1, brightness_max_2)
  • Bulb type (led_type_1, led_type_2)

  The work_mode instruction could not be tested and was not added.