PHP implementation of the LIFX LAN protocol.

WIP. Do not rely on any of this code as the API is currently subject to change.

• A 64-bit PHP build (no, I will not be adding 32-bit support).
• PHP >=7.1.1, or PHP 7.1.0 and a little-endian CPU.

• Implement multi-zone messages
• Write a client implementation with transport handling