WLED beta version 0.13.0-b3

Welcome to WLED 0.13.0-b3 "Toki"!

Time is the most valuable thing in the world. So let's use it right!

This version's highlights are (in addition to the ones from 0.13.0-b2)

• Segment names:
  Never forget which segment controls what again!
• Sync groups:
  Easily set up to 8 different groups to sync effects, rather than fiddling with ports
• Increased maximum segments to 16 (ESP8266) / 32 (ESP32) (experimental, please test) and segment data limit
• Improved various effects
• Added 15 new palettes from the sound reactive fork
• Added custom CSS skinning and custom holiday background feature
• Fixed several issues related to transitions
• A heap of other fixes and improvements

Thank you to @blazoncek for adding a lot of these features!

See the changelog for a complete list of changes!

What binary should I use?