Nanoleaf support

Implemented support for Nanoleaf devices.

API References:

• https://forum.nanoleaf.me/docs
• https://documenter.getpostman.com/view/1559645/RW1gEcCH

Additions:

• mDNS discovery of Nanoleaf devices on your network.
• Settings UI page for scanning and pairing Nanoleaf devices.
• Nanoleaf effects selection and control.
• Nanoleaf Direct mode support.

Notes:

• Direct mode is only supported for Nanoleaf Panels. Nanoleaf Canvas use a different socket protocol that I can't test since I only have Nanoleaf Panels.
• New dependency on libcurl.
• New dependency on a mdns.h header-only library.

I could use some help getting the curl dependency working across all platforms to make the CI pass. I can't get Qt Creator to build the project on Windows for some reason (unrelated to this MR).