Add command and property for device LED Setting

[milothomas]

• Adds a property to devices to get the status of the LED setting
• Adds a command to the Site Client to set the LED setting for a given device

Planning on adding a switch to the Home Assistant component if this is merged.

[MarkGodwin]

This is included in release 1.3.3. Thanks!

[milothomas]

This is included in release 1.3.3. Thanks!

Fantastic, thanks!